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.

A267729 Number of n X 2 0..1 arrays with every repeated value in every row and column greater than or equal to the previous repeated value.

Original entry on oeis.org

4, 16, 64, 225, 784, 2601, 8464, 26896, 84100, 259081, 788544, 2374681, 7086244, 20976400, 61653904, 180069561, 522945424, 1510954641, 4345446400, 12444741136, 35502850084, 100926300721, 285976813824, 807886380625, 2275928269924
Offset: 1

Views

Author

R. H. Hardin, Jan 20 2016

Keywords

Comments

Column 2 of A267735.

Examples

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

Crossrefs

Cf. A267735.

Formula

Empirical: a(n) = 6*a(n-1) - 6*a(n-2) - 19*a(n-3) + 24*a(n-4) + 24*a(n-5) - 19*a(n-6) - 6*a(n-7) + 6*a(n-8) - a(n-9).
Empirical g.f.: x*(4 - 8*x - 8*x^2 + 13*x^3 + 26*x^4 - 17*x^5 - 7*x^6 + 6*x^7 - x^8) / ((1 + x)^3*(1 - 3*x + x^2)^3). - Colin Barker, Mar 21 2018

A267730 Number of nX3 0..1 arrays with every repeated value in every row and column greater than or equal to the previous repeated value.

Original entry on oeis.org

8, 64, 512, 3375, 21952, 132651, 778688, 4410944, 24389000, 131872229, 700227072, 3659383421, 18863581528, 96071912000, 484106454208, 2416353439059, 11958715956032, 58732317850311, 286451826688000, 1388285542167616
Offset: 1

Views

Author

R. H. Hardin, Jan 20 2016

Keywords

Comments

Column 3 of A267735.

Examples

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

Crossrefs

Cf. A267735.

Formula

Empirical: a(n) = 12*a(n-1) -30*a(n-2) -120*a(n-3) +455*a(n-4) +576*a(n-5) -2142*a(n-6) -1980*a(n-7) +3180*a(n-8) +1980*a(n-9) -2142*a(n-10) -576*a(n-11) +455*a(n-12) +120*a(n-13) -30*a(n-14) -12*a(n-15) -a(n-16)

A267731 Number of nX4 0..1 arrays with every repeated value in every row and column greater than or equal to the previous repeated value.

Original entry on oeis.org

15, 225, 3375, 39330, 451278, 4705642, 47293550, 453985015, 4225323881, 38217977443, 337785304853, 2925589051944, 24901832826668, 208741721350212, 1726400790939232, 14108352548185285, 114068503433280219
Offset: 1

Views

Author

R. H. Hardin, Jan 20 2016

Keywords

Comments

Column 4 of A267735.

Examples

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

Crossrefs

Cf. A267735.

Formula

Empirical: a(n) = 35*a(n-1) -394*a(n-2) +232*a(n-3) +25654*a(n-4) -115936*a(n-5) -717645*a(n-6) +5125019*a(n-7) +12766457*a(n-8) -121244771*a(n-9) -191484356*a(n-10) +1834417718*a(n-11) +2792153531*a(n-12) -18018352091*a(n-13) -33384924485*a(n-14) +106494035885*a(n-15) +256764018305*a(n-16) -325748093657*a(n-17) -1087241545583*a(n-18) +521256387815*a(n-19) +2786626662683*a(n-20) -415177386323*a(n-21) -4689075652721*a(n-22) +179629691969*a(n-23) +5392367300186*a(n-24) -290951802380*a(n-25) -4225877115281*a(n-26) +592280920475*a(n-27) +2150396673689*a(n-28) -541241558807*a(n-29) -652332203444*a(n-30) +234631819886*a(n-31) +111137103164*a(n-32) -54396401114*a(n-33) -9115774331*a(n-34) +7011916217*a(n-35) +58342140*a(n-36) -479433676*a(n-37) +42704816*a(n-38) +14044864*a(n-39) -2279168*a(n-40) -40960*a(n-41) +16384*a(n-42)

A267732 Number of nX5 0..1 arrays with every repeated value in every row and column greater than or equal to the previous repeated value.

Original entry on oeis.org

28, 784, 21952, 451278, 9116396, 163879101, 2818160392, 45839624169, 718310821738, 10874476927778, 160107985766626, 2300536065892988, 32371741678239290, 447233651315427782, 6079896218958203376
Offset: 1

Views

Author

R. H. Hardin, Jan 20 2016

Keywords

Comments

Column 5 of A267735.

Examples

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

Crossrefs

Cf. A267735.

A267733 Number of nX6 0..1 arrays with every repeated value in every row and column greater than or equal to the previous repeated value.

Original entry on oeis.org

51, 2601, 132651, 4705642, 163879101, 4977655636, 143643342651, 3885150758271, 100631663710208, 2504347486850059, 60346174969864276, 1413700229500172653, 32327674542336206829, 723763598518295169155, 15905358480144812745511
Offset: 1

Views

Author

R. H. Hardin, Jan 20 2016

Keywords

Comments

Column 6 of A267735.

Examples

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

Crossrefs

Cf. A267735.

A267734 Number of nX7 0..1 arrays with every repeated value in every row and column greater than or equal to the previous repeated value.

Original entry on oeis.org

92, 8464, 778688, 47293550, 2818160392, 143643342651, 6910434801148, 308861582336509, 13143892092247732, 534580146047554692, 20962594989587781990, 796203995351206031909, 29426773353675857436150
Offset: 1

Views

Author

R. H. Hardin, Jan 20 2016

Keywords

Comments

Column 7 of A267735.

Examples

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

Crossrefs

Cf. A267735.

A267728 Number of n X n 0..1 arrays with every repeated value in every row and column greater than or equal to the previous repeated value.

Original entry on oeis.org

2, 16, 512, 39330, 9116396, 4977655636, 6910434801148, 22619851307136958, 176312563812861434000
Offset: 1

Views

Author

R. H. Hardin, Jan 20 2016

Keywords

Comments

Diagonal of A267735.

Examples

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

Crossrefs

Cf. A267735.
Showing 1-7 of 7 results.