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 1-6 of 6 results.

A296536 Number of n X 3 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 or 4 neighboring 1s.

Original entry on oeis.org

1, 5, 16, 37, 96, 254, 654, 1709, 4472, 11621, 30257, 78899, 205534, 535394, 1395017, 3634476, 9468722, 24669483, 64272370, 167449745, 436262198, 1136608103, 2961236309, 7714995835, 20100110050, 52367403411, 136434332477, 355456392933
Offset: 1

Views

Author

R. H. Hardin, Dec 15 2017

Keywords

Examples

			Some solutions for n=7:
..0..1..1. .1..1..0. .0..0..0. .0..1..0. .0..0..0. .0..0..1. .0..1..0
..0..1..0. .1..0..0. .1..1..0. .1..1..1. .1..1..0. .1..1..1. .1..1..1
..0..0..0. .0..0..1. .1..0..0. .0..1..0. .1..0..0. .1..0..0. .0..1..0
..1..1..0. .0..1..1. .0..0..1. .1..1..0. .0..0..0. .0..1..1. .1..1..0
..1..0..0. .0..0..0. .0..1..1. .0..0..0. .1..1..0. .0..1..0. .0..0..1
..0..1..0. .1..1..0. .0..0..0. .0..0..0. .1..0..0. .1..1..0. .1..1..1
..1..1..0. .1..0..0. .0..0..0. .0..0..0. .0..0..0. .0..0..0. .1..0..0
		

Crossrefs

Column 3 of A296541.

Formula

Empirical: a(n) = 2*a(n-1) - a(n-2) + 5*a(n-3) + a(n-4) + 6*a(n-5) + 7*a(n-6) + a(n-7) + 3*a(n-8) + 3*a(n-9) - 3*a(n-10) - 4*a(n-11) - a(n-12).
Empirical g.f.: x*(1 + 3*x + 7*x^2 + 5*x^3 + 12*x^4 + 8*x^5 + 4*x^6 + 6*x^7 - 7*x^9 - 5*x^10 - x^11) / ((1 + x^2 + x^3)*(1 - 2*x - 4*x^3 + x^4 - 2*x^5 - 4*x^6 + 3*x^8 + x^9)). - Colin Barker, Feb 23 2019

A296537 Number of nX4 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 or 4 neighboring 1s.

Original entry on oeis.org

1, 8, 37, 126, 431, 1554, 5601, 20036, 71722, 256991, 920643, 3297782, 11813230, 42316775, 151584446, 542999656, 1945111540, 6967686648, 24959322680, 89408160916, 320273851760, 1147270357089, 4109699588023, 14721578711022
Offset: 1

Views

Author

R. H. Hardin, Dec 15 2017

Keywords

Comments

Column 4 of A296541.

Examples

			Some solutions for n=7
..0..0..1..0. .0..1..0..0. .1..1..0..0. .1..1..1..0. .0..1..1..0
..1..1..1..0. .1..1..0..0. .1..0..0..0. .1..1..0..0. .0..1..0..0
..1..0..0..1. .0..0..1..0. .0..1..1..1. .1..0..0..0. .0..0..0..0
..0..0..1..1. .1..1..1..0. .0..1..1..0. .0..1..1..0. .0..0..0..0
..0..0..0..0. .1..0..0..0. .0..1..0..0. .0..1..0..0. .1..1..1..0
..0..0..1..0. .0..1..0..0. .0..0..0..1. .1..1..0..0. .1..1..0..0
..0..1..1..0. .1..1..0..0. .0..0..1..1. .0..0..0..0. .1..0..0..0
		

Crossrefs

Cf. A296541.

Formula

Empirical: a(n) = 6*a(n-1) -13*a(n-2) +21*a(n-3) -22*a(n-4) +7*a(n-5) +18*a(n-6) -37*a(n-7) -34*a(n-8) +111*a(n-9) -210*a(n-10) +91*a(n-11) +161*a(n-12) -194*a(n-13) +84*a(n-14) +464*a(n-15) -73*a(n-16) +283*a(n-17) +265*a(n-18) -165*a(n-19) -208*a(n-20) -363*a(n-21) -705*a(n-22) -701*a(n-23) -687*a(n-24) -589*a(n-25) -418*a(n-26) -171*a(n-27) -30*a(n-28) +142*a(n-29) +214*a(n-30) +244*a(n-31) +218*a(n-32) +175*a(n-33) +114*a(n-34) +69*a(n-35) +34*a(n-36) +14*a(n-37) +4*a(n-38) +a(n-39)

A296538 Number of nX5 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 or 4 neighboring 1s.

Original entry on oeis.org

1, 15, 96, 431, 2104, 10734, 53995, 270584, 1360373, 6842490, 34397698, 172916932, 869345996, 4370695957, 21973721785, 110473467193, 555410077197, 2792348324294, 14038652292860, 70579951706145, 354843911694537
Offset: 1

Views

Author

R. H. Hardin, Dec 15 2017

Keywords

Comments

Column 5 of A296541.

Examples

			Some solutions for n=7
..0..0..0..0..0. .1..1..1..0..0. .0..0..0..1..0. .0..0..1..0..0
..1..1..1..0..1. .1..1..0..0..0. .0..1..1..1..0. .1..1..1..0..1
..1..1..0..1..1. .1..0..0..1..0. .0..1..0..0..0. .1..0..0..1..1
..1..0..0..0..0. .0..1..1..1..0. .0..0..1..1..1. .0..0..1..1..1
..0..1..0..0..0. .0..1..0..0..1. .0..1..0..0..1. .0..0..0..0..0
..1..1..0..0..0. .1..1..0..1..1. .0..1..0..0..1. .0..1..0..0..0
..0..0..0..0..0. .0..0..1..1..1. .0..1..1..1..0. .1..1..0..0..0
		

Crossrefs

Cf. A296541.

A296539 Number of n X 6 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 or 4 neighboring 1's.

Original entry on oeis.org

1, 26, 254, 1554, 10734, 78660, 560942, 3987615, 28515358, 203892406, 1456644769, 10408749868, 74388848144, 531625780268, 3799304215218, 27152396258135, 194049997801018, 1386817640950191, 9911186585406690, 70832453927754955
Offset: 1

Views

Author

R. H. Hardin, Dec 15 2017

Keywords

Comments

Column 6 of A296541.

Examples

			Some solutions for n=6
..1..1..0..0..1..0. .0..1..1..1..1..0. .0..0..1..1..1..0. .0..0..1..1..1..1
..1..0..0..1..1..0. .0..1..1..1..0..0. .0..0..1..1..0..0. .0..1..0..0..0..1
..0..1..0..0..0..0. .1..0..0..1..0..1. .1..1..0..1..0..0. .1..0..0..0..1..0
..1..1..0..0..1..1. .1..0..0..1..1..1. .1..1..0..1..1..0. .1..1..0..1..0..0
..0..0..1..0..1..0. .1..1..1..1..0..0. .1..1..1..1..0..1. .0..1..0..1..0..1
..0..1..1..0..0..0. .0..0..1..0..0..0. .1..0..1..0..1..1. .0..1..1..0..1..1
		

Crossrefs

Cf. A296541.

A296540 Number of nX7 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 or 4 neighboring 1s.

Original entry on oeis.org

1, 45, 654, 5601, 53995, 560942, 5705431, 57470370, 581613058, 5896361722, 59744304510, 605287549399, 6133281385115, 62150472842382, 629792949015747, 6381981797680641, 64672057071608258, 655359047486913615
Offset: 1

Views

Author

R. H. Hardin, Dec 15 2017

Keywords

Comments

Column 7 of A296541.

Examples

			Some solutions for n=5
..0..1..0..1..1..0..0. .0..0..0..1..1..0..0. .0..0..1..0..0..0..0
..1..1..0..1..0..0..0. .0..1..1..0..1..0..0. .1..1..1..0..0..1..1
..0..0..0..0..0..0..0. .1..0..0..0..1..0..0. .1..0..0..0..0..1..0
..0..1..1..0..1..0..0. .1..0..1..1..0..0..0. .0..0..1..0..0..0..0
..0..1..0..1..1..0..0. .1..1..0..0..0..0..0. .0..1..1..0..0..0..0
		

Crossrefs

Cf. A296541.

A296535 Number of n X n 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 or 4 neighboring 1's.

Original entry on oeis.org

1, 3, 16, 126, 2104, 78660, 5705431, 820373528, 239372827502, 141301759543525, 168080053760638246, 403684916425998696873
Offset: 1

Views

Author

R. H. Hardin, Dec 15 2017

Keywords

Comments

Diagonal of A296541.

Examples

			Some solutions for n=6
..0..1..0..0..0..0. .0..0..0..1..0..0. .0..0..0..1..1..0. .0..1..1..1..1..0
..1..1..0..1..1..0. .0..1..1..1..0..0. .0..0..1..0..1..0. .1..0..0..0..1..0
..0..0..1..0..1..0. .0..1..0..0..0..0. .0..1..0..0..1..0. .1..1..1..1..0..0
..0..1..0..0..1..0. .1..1..0..1..0..0. .0..1..0..0..1..1. .0..0..0..0..0..0
..1..0..1..1..0..0. .0..0..1..1..0..0. .1..0..0..0..0..1. .0..0..0..0..0..0
..1..1..0..0..0..0. .0..0..0..0..0..0. .1..1..1..1..1..0. .0..0..0..0..0..0
		

Crossrefs

Cf. A296541.
Showing 1-6 of 6 results.