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.

A303318 Number of 6Xn 0..1 arrays with every element equal to 0, 1, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Original entry on oeis.org

32, 14, 34, 165, 349, 1221, 7096, 30280, 102683, 403872, 1783894, 7248640, 27856927, 111871711, 461547267, 1859721535, 7397094062, 29793428041, 120739708314, 486065859963, 1951092593903, 7859276232228, 31701254570200, 127635189909079
Offset: 1

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Author

R. H. Hardin, Apr 21 2018

Keywords

Comments

Row 6 of A303314.

Examples

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

Crossrefs

Cf. A303314.

Formula

Empirical: a(n) = a(n-1) +3*a(n-2) +18*a(n-3) +87*a(n-4) +23*a(n-5) -149*a(n-6) -305*a(n-7) -678*a(n-8) -45*a(n-9) +981*a(n-10) +937*a(n-11) +1834*a(n-12) +317*a(n-13) -1968*a(n-14) -1457*a(n-15) -2157*a(n-16) -964*a(n-17) +830*a(n-18) +254*a(n-19) +161*a(n-20) +152*a(n-21) -15*a(n-22) -3*a(n-23) for n>28