cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-10 of 13 results. Next

A264266 Number of (n+1) X (2+1) arrays of permutations of 0..n*3+2 with each element having index change +-(.,.) 0,0 1,0 or 1,2.

Original entry on oeis.org

10, 48, 305, 1800, 10933, 65856, 397970, 2402455, 14508869, 87609600, 529045373, 3194668217, 19291314050, 116492151552, 703447966957, 4247829912600, 25650883291001, 154895038005840, 935346867163930, 5648171599648271
Offset: 1

Views

Author

R. H. Hardin, Nov 10 2015

Keywords

Examples

			Some solutions for n=4:
..3..4..2....5..1..2....0..4..5....3..1..2....0..1..2....3..4..5....3..1..2
..0..1..5....0..7..8....3..1..2....0..4..5....3..7..8....0..1..2....8..7..0
..9..7..8....6..4..3....9..7.11....6..7.11....6..4..5....6.10..8...11..4..5
.14.13..6...14.13.11....6.13..8...12.13..8....9.10.14...12..7.11...12.10..6
.12.10.11...12.10..9...12.10.14....9.10.14...12.13.11....9.13.14....9.13.14
		

Crossrefs

Column 2 of A264272.

Formula

Empirical: a(n) = 4*a(n-1) + 16*a(n-2) - 16*a(n-3) - 41*a(n-4) + 16*a(n-5) + 16*a(n-6) - 4*a(n-7) - a(n-8).
Empirical g.f.: x*(10 + 8*x - 47*x^2 - 28*x^3 + 31*x^4 + 12*x^5 - 5*x^6 - x^7) / ((1 + x - x^2)*(1 - x - x^2)*(1 - 4*x - 13*x^2 + 4*x^3 + x^4)). - Colin Barker, Jan 07 2019

A264267 Number of (n+1)X(3+1) arrays of permutations of 0..n*4+3 with each element having index change +-(.,.) 0,0 1,0 or 1,2.

Original entry on oeis.org

25, 256, 3721, 50625, 707281, 9834496, 137007025, 1908029761, 26575846441, 370150560000, 5155538077561, 71807337114241, 1000147266261025, 13930253758038016, 194023406526536161, 2702397428803850625
Offset: 1

Views

Author

R. H. Hardin, Nov 10 2015

Keywords

Comments

Column 3 of A264272.

Examples

			Some solutions for n=4
..0..1..2..3....0..1..2..3....0..1..2..3....6..5..2..3....6..7..2..3
..4..5.10..7....4..5..6.11...10..9..6..7....4..1..0..7....0..1.10.11
.12.15..6.11...14.15.10..7....8..5..4.15...12.13.14.11....4..9.14..5
..8.19.14..9...12..9..8.19...16.13.18.11....8..9.10.19....8.19.18.15
.16.17.18.13...16.17.18.13...12.17.14.19...16.17.18.15...16.17.12.13
		

Crossrefs

Cf. A264272.

Formula

Empirical: a(n) = 14*a(n-1) +14*a(n-2) -210*a(n-3) +210*a(n-5) -14*a(n-6) -14*a(n-7) +a(n-8)

A264268 Number of (n+1)X(4+1) arrays of permutations of 0..n*5+4 with each element having index change +-(.,.) 0,0 1,0 or 1,2.

Original entry on oeis.org

65, 1280, 40626, 1143000, 33729146, 981994496, 28735927165, 839596650695, 24544787527541, 717416324352000, 20970567317759053, 612971699603292777, 17917345209329491525, 523728155369756381184, 15308707141186512270826
Offset: 1

Views

Author

R. H. Hardin, Nov 10 2015

Keywords

Comments

Column 4 of A264272.

Examples

			Some solutions for n=3
..5..6..9..3..4....0..1..9..3..4....5..1..2..3..4....7..8..2..3..4
..0..1.12..8..2...12.11.14..8..2....0.11.14..8..9....0..1.12.13..9
.10.18..7.13.14...15..6..5.13..7...15.18..7..6.19...17..6..5.18.19
.15.16.17.11.19...10.16.17.18.19...10.16.17.13.12...15.16.10.11.14
		

Crossrefs

Cf. A264272.

Formula

Empirical recurrence of order 52 (see link above)

A264269 Number of (n+1)X(5+1) arrays of permutations of 0..n*6+5 with each element having index change +-(.,.) 0,0 1,0 or 1,2.

Original entry on oeis.org

169, 6400, 443556, 25806400, 1608491236, 98054154496, 6027088830169, 369450492999025, 22668952280018641, 1390477924568678400, 85299475440342309169, 5232533604703646465169, 320983989238338461532025
Offset: 1

Views

Author

R. H. Hardin, Nov 10 2015

Keywords

Comments

Column 5 of A264272.

Examples

			Some solutions for n=2
..8..7..2.11..4..5....0..7.10..3..4..5....0..9..8.11..4..5....0..1..2..3.10..5
..0.15.14..1.10..3....6.15.14..1..2.17...12..1..2.15.16..3...14..7.16.15..4.17
.12.13..6..9.16.17...12.13..8..9.16.11....6.13.14..7.10.17...12.13..6..9..8.11
		

Crossrefs

Cf. A264272.

Formula

Empirical recurrence of order 96 (see link above)

A264270 Number of (n+1)X(6+1) arrays of permutations of 0..n*7+6 with each element having index change +-(.,.) 0,0 1,0 or 1,2.

Original entry on oeis.org

442, 32000, 4861800, 600090240, 80568542340, 10563801093680, 1398071103483637, 184549492112860840, 24385615337150116761, 3221323854569532915840, 425580239886807520132066, 56223231572414176702873320
Offset: 1

Views

Author

R. H. Hardin, Nov 10 2015

Keywords

Comments

Column 6 of A264272.

Examples

			Some solutions for n=2
..0..1..2..3..4.12..6....7..8.11.12..4..5.13....0..1..2..3..4.12..6
.16..8..9.19.11..5.20....0..1.18.19..2..3..6...14.15..9.10.20..5.13
.14.15..7.17.18.10.13...14.15.16.17..9.10.20....7..8.16.17.18.19.11
		

Crossrefs

Cf. A264272.

A264271 Number of (n+1)X(7+1) arrays of permutations of 0..n*8+7 with each element having index change +-(.,.) 0,0 1,0 or 1,2.

Original entry on oeis.org

1156, 160000, 53290000, 13954224384, 4035639032100, 1138084297605025, 324302970384650401, 92186952472695083584, 26232276993922103173281, 7462849422249980275347009, 2123325373891488033889110724
Offset: 1

Views

Author

R. H. Hardin, Nov 10 2015

Keywords

Comments

Column 7 of A264272.

Examples

			Some solutions for n=2
..0..1..2.11.14..5..6..7....0.11.10..3.12..5..6..7....0.11..2..3.14..5..6..7
.16.19.10.21.12..3..4.15...16..1..2.19.22.13..4.23....8..9.10..1..4.13.22.15
..8.17.18..9.20.13.22.23....8.17.18..9.20.21.14.15...16.17.18.19.20.21.12.23
		

Crossrefs

Cf. A264272.

A264273 Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having index change +-(.,.) 0,0 1,0 or 1,2.

Original entry on oeis.org

9, 48, 256, 1280, 6400, 32000, 160000, 800000, 4000000, 20000000, 100000000, 500000000, 2500000000, 12500000000, 62500000000, 312500000000, 1562500000000, 7812500000000, 39062500000000, 195312500000000, 976562500000000
Offset: 1

Views

Author

R. H. Hardin, Nov 10 2015

Keywords

Examples

			Some solutions for n=4:
..7..1..9..8..4....5..8..9..3..4....5..1..2..3..4....7..1..2..3..4
.12.13..0..3..2....0.11..7..1..2....0.11..7.13..9....0.11.12..8.14
.10.11..5..6.14...10..6.12.13.14...10..6.12..8.14...10..6..5.13..9
		

Crossrefs

Row 2 of A264272.

Formula

Empirical: a(n) = 5*a(n-1) for n>3.
Conjectures from Colin Barker, Jan 07 2019: (Start)
G.f.: x*(9 + 3*x + 16*x^2) / (1 - 5*x).
a(n) = 256*5^(n-3) for n>2.
(End)

A264274 Number of (3+1)X(n+1) arrays of permutations of 0..n*4+3 with each element having index change +-(.,.) 0,0 1,0 or 1,2.

Original entry on oeis.org

25, 305, 3721, 40626, 443556, 4861800, 53290000, 586058600, 6445199524, 70892939818, 779775536401, 8576942789777, 94339901914129, 1037668357033074, 11413575775898244, 125540825889208392, 1380855507020471056
Offset: 1

Views

Author

R. H. Hardin, Nov 10 2015

Keywords

Comments

Row 3 of A264272.

Examples

			Some solutions for n=4
..0..1..9..8..4....0..1..9..8..4....5..1..9..3..4....5..8..9..3..4
.10.13..7..3..2...10..6.14..3..2....0..6..2.13.14...12.11..0..1..2
.17.11..5..6.14....5.11.17.13..7...10.16.19..8..7...15..6..7.18.19
.15.16.12.18.19...15.16.12.18.19...15.11.17.18.12...10.16.17.13.14
		

Crossrefs

Cf. A264272.

Formula

Empirical: a(n) = 11*a(n-1) +10*a(n-2) -110*a(n-3) -111*a(n-4) +1210*a(n-5) +1341*a(n-6) -14630*a(n-7) -111*a(n-8) -110*a(n-9) +1451*a(n-10) -1451*a(n-12) +110*a(n-13) +111*a(n-14) +14630*a(n-15) -1341*a(n-16) -1210*a(n-17) +111*a(n-18) +110*a(n-19) -10*a(n-20) -11*a(n-21) +a(n-22)

A264275 Number of (4+1) X (n+1) arrays of permutations of 0..n*5+4 with each element having index change +-(.,.) 0,0 1,0 or 1,2.

Original entry on oeis.org

64, 1800, 50625, 1143000, 25806400, 600090240, 13954224384, 323177889984, 7484754845584, 173362944655124, 4015456912022689, 93006360976711231, 2154221392895732449, 49896286681978765567, 1155702674228671452961, 26768498558076022772640, 620014585959103244313600
Offset: 1

Views

Author

R. H. Hardin, Nov 10 2015

Keywords

Examples

			Some solutions for n=3:
..4..7..2..3....0..5..2..3....0..5..2..3....4..1..2..3....4..7..2..3
..0..1.10.11....4..1.10.11....8.11..6..1....0..9.10..7....0..5.10..1
..8..5..6.15....8.13..6..7....4.13.14..7...14.15..6..5....8.13..6.11
.12.17.14..9...12..9.14.15...12..9.10.19...12.17..8.11...16..9.14.19
.16.13.18.19...16.17.18.19...16.17.18.15...16.13.18.19...12.17.18.15
		

Crossrefs

Row 4 of A264272.

Formula

Empirical: a(n) = 24*a(n-1) -467*a(n-3) +625*a(n-4) -5260*a(n-5) -15671*a(n-6) +466107*a(n-7) -420812*a(n-8) +879839*a(n-9) -157761*a(n-10) -732744*a(n-11) +1973397*a(n-12) -2238123*a(n-13) +1652184*a(n-14) -1326213*a(n-15) -1823409*a(n-16) +641268*a(n-17) -3529953*a(n-18) -222939*a(n-19) -250668*a(n-20) -21735*a(n-21) +9153*a(n-22) +2916*a(n-24) +243*a(n-25) for n>27.

A264276 Number of (5+1)X(n+1) arrays of permutations of 0..n*6+5 with each element having index change +-(.,.) 0,0 1,0 or 1,2.

Original entry on oeis.org

169, 10933, 707281, 33729146, 1608491236, 80568542340, 4035639032100, 200983996390320, 10009459836154944, 498478049285216352, 24824552941574755216, 1236574408590216008500, 61596930731403632640625
Offset: 1

Views

Author

R. H. Hardin, Nov 10 2015

Keywords

Comments

Row 5 of A264272.

Examples

			Some solutions for n=2
..3..1..2....3..1..5....5..4..2....5..1..2....3..1..2....0..4..2....5..4..2
..0..4..5....0..4..2....3..1..0....6..7..0....0..4..8....3..1..8....6..1..0
..6.10..8....6..7..8....6.10.11...11..4..3....9.10..5....9..7..5....3.10.11
..9..7.11....9.10.11....9..7..8...14.10..8....6..7.11....6.13.14....9..7..8
.15.13.14...15.13.14...15.16.17...12.13..9...12.13.17...17.10.11...12.16.14
.12.16.17...12.16.17...12.13.14...15.16.17...15.16.14...15.16.12...15.13.17
		

Crossrefs

Cf. A264272.
Showing 1-10 of 13 results. Next