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A302511 Number of nX4 0..1 arrays with every element equal to 0, 1, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
5, 5, 15, 28, 48, 89, 163, 297, 544, 1004, 1848, 3393, 6237, 11481, 21122, 38834, 71418, 131383, 241665, 444451, 817450, 1503590, 2765570, 5086571, 9355603, 17207807, 31650188, 58213496, 107071156, 196935005, 362220199, 666226093, 1225380420 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A302515.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +2*a(n-3) +2*a(n-4) -a(n-6) -a(n-7) for n>10

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A302515.

Sequence in context: A185905 A050341 A140360 * A178821 A145599 A275016

Adjacent sequences:  A302508 A302509 A302510 * A302512 A302513 A302514

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 09 2018

STATUS

approved

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Last modified February 16 21:59 EST 2019. Contains 320200 sequences. (Running on oeis4.)