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A318541 Number of nX4 0..1 arrays with every element unequal to 0, 1, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 1
5, 5, 13, 31, 78, 207, 516, 1288, 3270, 8271, 20866, 52679, 133064, 336062, 848616, 2143101, 5412264, 13667874, 34516655, 87168177, 220132818, 555919912, 1403912579, 3545419471, 8953548234, 22611157039, 57101877461, 144204222586 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A318545.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +7*a(n-3) +3*a(n-4) +10*a(n-5) -a(n-6) +4*a(n-7) -6*a(n-8) -a(n-9) -a(n-10) -a(n-12) +a(n-13) for n>14

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A318545.

Sequence in context: A352209 A171663 A126439 * A076903 A192987 A252768

Adjacent sequences:  A318538 A318539 A318540 * A318542 A318543 A318544

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 28 2018

STATUS

approved

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Last modified June 25 19:25 EDT 2022. Contains 354851 sequences. (Running on oeis4.)