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A303313 Number of nX7 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. 1
21, 23, 158, 439, 1799, 7096, 26184, 100128, 387892, 1473950, 5617780, 21537368, 82283698, 314136752, 1201134460, 4591062616, 17541004106, 67038118694, 256214474112, 979116873266, 3741800363318, 14300090089956, 54649561868376 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A303314.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = a(n-1) +a(n-2) +36*a(n-3) +23*a(n-4) +15*a(n-5) -252*a(n-6) -288*a(n-7) -81*a(n-8) +830*a(n-9) +496*a(n-10) +172*a(n-11) -720*a(n-12) -184*a(n-13) -396*a(n-14) +352*a(n-15) -248*a(n-16) +112*a(n-17) -176*a(n-18) -64*a(n-20) for n>23

EXAMPLE

Some solutions for n=5

..0..1..0..1..0..0..0. .0..1..0..1..0..1..0. .0..0..1..0..1..0..1

..0..1..1..1..0..1..0. .0..1..0..0..0..1..0. .1..1..1..0..1..0..1

..0..1..0..1..0..1..0. .0..1..0..1..0..1..0. .1..0..1..0..1..1..1

..0..0..0..1..0..1..0. .0..1..1..1..0..1..0. .1..0..1..0..1..0..1

..1..1..0..1..0..0..0. .0..1..0..1..0..1..0. .1..1..1..0..1..0..1

CROSSREFS

Cf. A303314.

Sequence in context: A304269 A302679 A302514 * A257642 A332922 A066867

Adjacent sequences:  A303310 A303311 A303312 * A303314 A303315 A303316

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 21 2018

STATUS

approved

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Last modified October 18 03:25 EDT 2021. Contains 348065 sequences. (Running on oeis4.)