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 1-7 of 7 results.

A263218 Number of (n+1)X(2+1) 0..2 arrays with each row and column divisible by 5, read as a base-3 number with top and left being the most significant digits.

Original entry on oeis.org

2, 14, 72, 343, 1920, 11444, 68112, 405019, 2422502, 14527358, 87130296, 522558079, 3134839248, 18808467356, 112848487824, 677075548723, 4062417593558, 24374464952438, 146246626666296, 877478675492551, 5264869525163232
Offset: 1

Views

Author

R. H. Hardin, Oct 12 2015

Keywords

Comments

Column 2 of A263224.

Examples

			Some solutions for n=4
..2..2..1....1..2..0....0..1..2....0..1..2....0..1..2....0..0..0....2..2..1
..1..0..1....2..2..1....1..2..0....1..2..0....1..0..1....1..2..0....1..0..1
..2..2..1....0..0..0....2..2..1....2..0..2....0..1..2....0..0..0....2..2..1
..1..0..1....0..1..2....1..0..1....0..0..0....1..0..1....2..2..1....2..0..2
..0..0..0....0..1..2....2..2..1....0..0..0....0..0..0....2..0..2....2..0..2
		

Crossrefs

Cf. A263224.

Formula

Empirical: a(n) = 8*a(n-1) -16*a(n-2) +32*a(n-3) +35*a(n-4) -664*a(n-5) +1328*a(n-6) -2656*a(n-7) +3121*a(n-8) +6904*a(n-9) -13808*a(n-10) +27616*a(n-11) -40643*a(n-12) -6248*a(n-13) +12496*a(n-14) -24992*a(n-15) +37488*a(n-16)

A263219 Number of (n+1)X(3+1) 0..2 arrays with each row and column divisible by 5, read as a base-3 number with top and left being the most significant digits.

Original entry on oeis.org

4, 72, 1009, 12601, 198892, 3345984, 56362801, 951167305, 16140651460, 274301213400, 4662032059249, 79241699410777, 1347050532750556, 22899642182348976, 389291621638482865, 6617932860469046761
Offset: 1

Views

Author

R. H. Hardin, Oct 12 2015

Keywords

Comments

Column 3 of A263224.

Examples

			Some solutions for n=4
..1..0..1..0....2..2..2..2....1..0..1..0....0..1..2..0....0..2..2..1
..0..0..1..2....0..0..1..2....2..0..0..1....2..1..0..2....2..0..0..1
..2..1..0..2....0..2..2..1....1..0..1..0....0..1..2..0....0..0..0..0
..0..2..0..2....2..0..2..0....2..0..0..1....2..1..0..2....2..2..2..2
..1..0..2..2....2..0..2..0....0..0..0..0....0..0..0..0....0..2..2..1
		

Crossrefs

Cf. A263224.

Formula

Empirical: a(n) = 24*a(n-1) -119*a(n-2) +2261*a(n-4) -54264*a(n-5) +269059*a(n-6) -1067290*a(n-8) +25614960*a(n-9) -127007510*a(n-10) +160126570*a(n-12) -3843037680*a(n-13) +19055061830*a(n-14) -8388238565*a(n-16) +201317725560*a(n-17) -998200389235*a(n-18) +103391555281*a(n-20) -2481397326744*a(n-21) +12303595078439*a(n-22) -95162378256*a(n-24) +2283897078144*a(n-25) -11324323012464*a(n-26)

A263220 Number of (n+1)X(4+1) 0..2 arrays with each row and column divisible by 5, read as a base-3 number with top and left being the most significant digits.

Original entry on oeis.org

7, 343, 12601, 475539, 22342751, 1094138875, 53375395657, 2607171566653, 127682197727311, 6256406902789159, 306545703110117209, 15020102223676251147, 735979598601461106119, 36062999023016301797227
Offset: 1

Views

Author

R. H. Hardin, Oct 12 2015

Keywords

Comments

Column 4 of A263224.

Examples

			Some solutions for n=3
..1..0..2..0..1....2..2..2..0..1....0..1..0..1..0....2..0..2..0..0
..1..2..2..2..1....0..0..0..1..2....1..2..2..0..2....0..1..0..1..0
..1..2..1..0..1....0..2..0..0..1....2..1..0..2..0....2..2..2..0..1
..1..1..0..2..1....1..0..1..1..2....0..2..2..2..2....0..0..0..1..2
		

Crossrefs

Cf. A263224.

Formula

Empirical recurrence of order 89 (see link above)

A263221 Number of (n+1) X (5+1) 0..2 arrays with each row and column divisible by 5, read as a base-3 number with top and left being the most significant digits.

Original entry on oeis.org

13, 1920, 198892, 22342751, 3126162435, 456363243352, 66317081173996, 9651690803653879, 1408397535551222617, 205625917583136780312, 30019612862946349286716, 4382688566369987885721551
Offset: 1

Views

Author

R. H. Hardin, Oct 12 2015

Keywords

Comments

Column 5 of A263224.

Examples

			Some solutions for n=3
..0..1..1..1..2..2....0..2..2..1..1..2....1..0..2..0..1..0....0..1..0..2..2..0
..2..0..0..2..2..0....1..0..2..0..1..0....0..2..2..0..1..1....2..1..0..0..1..0
..2..1..2..1..1..2....2..0..1..1..1..0....1..0..2..0..1..0....0..1..0..2..2..0
..1..0..2..2..0..0....0..1..0..0..1..1....0..2..2..0..1..1....2..1..0..0..1..0
		

Crossrefs

Cf. A263224.

A263222 Number of (n+1)X(6+1) 0..2 arrays with each row and column divisible by 5, read as a base-3 number with top and left being the most significant digits.

Original entry on oeis.org

26, 11444, 3345984, 1094138875, 456363243352, 199878687706434, 87072717791078712, 37998530090131229539, 16633155845877772714382, 7285320640434422479387484, 3190753333014806396532157872
Offset: 1

Views

Author

R. H. Hardin, Oct 12 2015

Keywords

Comments

Column 6 of A263224.

Examples

			Some solutions for n=2
..1..1..1..1..0..1..2....1..0..1..2..1..0..2....1..0..1..2..2..2..2
..0..0..2..2..1..0..0....0..1..0..2..0..1..0....2..0..0..2..0..2..2
..1..1..0..0..2..1..2....1..2..1..1..1..2..2....0..0..1..1..2..1..1
		

Crossrefs

Cf. A263224.

A263223 Number of (n+1)X(7+1) 0..2 arrays with each row and column divisible by 5, read as a base-3 number with top and left being the most significant digits.

Original entry on oeis.org

52, 68112, 56362801, 53375395657, 66317081173996, 87072717791078712, 113626071226676220337, 148577011002706188270265, 194947288514689323686605300, 255965788647405918475696491840
Offset: 1

Views

Author

R. H. Hardin, Oct 12 2015

Keywords

Comments

Column 7 of A263224.

Examples

			Some solutions for n=2
..1..2..2..1..2..1..1..2....2..0..0..0..0..0..2..0....2..1..2..2..2..2..0..2
..0..2..2..2..2..0..0..0....2..0..0..0..0..0..2..0....0..0..0..0..2..2..1..0
..1..1..1..0..1..1..1..2....1..0..0..0..0..0..1..0....2..1..2..2..1..1..2..2
		

Crossrefs

Cf. A263224.

A263217 Number of (n+1)X(n+1) 0..2 arrays with each row and column divisible by 5, read as a base-3 number with top and left being the most significant digits.

Original entry on oeis.org

1, 14, 1009, 475539, 3126162435, 199878687706434, 113626071226676220337, 582273491524766112505402255
Offset: 1

Views

Author

R. H. Hardin, Oct 12 2015

Keywords

Comments

Diagonal of A263224.

Examples

			Some solutions for n=3
..0..0..1..2....1..2..1..2....0..2..0..2....2..2..2..2....2..0..0..1
..0..0..0..0....2..0..2..0....0..1..0..1....1..2..1..2....1..1..1..1
..0..0..1..2....0..2..0..2....1..2..0..0....2..1..0..2....0..2..2..1
..0..0..0..0....0..0..0..0....2..1..0..2....1..0..2..2....2..0..0..1
		

Crossrefs

Cf. A263224.
Showing 1-7 of 7 results.