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A298569 Number of nX2 0..1 arrays with every element equal to 0, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero. 1
1, 4, 4, 8, 36, 52, 100, 356, 628, 1220, 3668, 7268, 14516, 38980, 82452, 169508, 423284, 926980, 1953236, 4661476, 10384180, 22302148, 51781012, 116208548, 253089012, 578128516, 1300672852, 2860550756, 6473222836, 14566091588 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A298575.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +8*a(n-3) -4*a(n-4)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A298575.

Sequence in context: A137717 A096252 A102369 * A281717 A205971 A118016

Adjacent sequences:  A298566 A298567 A298568 * A298570 A298571 A298572

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 22 2018

STATUS

approved

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Last modified January 21 04:24 EST 2021. Contains 340332 sequences. (Running on oeis4.)