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A303515 Number of 4Xn 0..1 arrays with every element equal to 0, 1, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
8, 81, 420, 1596, 7951, 43448, 222205, 1111647, 5678762, 29269343, 150041512, 767385774, 3932021861, 20164462418, 103363694493, 529734973779, 2715304606630, 13919219193295, 71350445359330, 365738495870594 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A303513.

LINKS

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

R. H. Hardin, Empirical recurrence of order 63

FORMULA

Empirical recurrence of order 63 (see link above)

EXAMPLE

Some solutions for n=5

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

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

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

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

CROSSREFS

Cf. A303513.

Sequence in context: A303018 A247536 A302822 * A027768 A236749 A343274

Adjacent sequences:  A303512 A303513 A303514 * A303516 A303517 A303518

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 25 2018

STATUS

approved

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Last modified December 8 17:01 EST 2021. Contains 349596 sequences. (Running on oeis4.)