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A317761 Number of nX5 0..1 arrays with every element unequal to 0, 1 or 2 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 1
16, 42, 52, 72, 109, 177, 302, 532, 955, 1733, 3164, 5796, 10637, 19541, 35918, 66040, 121443, 223345, 410772, 755504, 1389565, 2555785, 4700798, 8646092, 15902619, 29249453, 53798108, 98950124, 181997629, 334745805, 615693502, 1132436880 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A317764.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) -a(n-4) for n>6

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A317764.

Sequence in context: A200408 A280184 A228685 * A318340 A318072 A304954

Adjacent sequences:  A317758 A317759 A317760 * A317762 A317763 A317764

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 06 2018

STATUS

approved

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Last modified November 14 22:17 EST 2019. Contains 329134 sequences. (Running on oeis4.)