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A305091 Number of nX2 0..1 arrays with every element unequal to 1, 2, 4, 6 or 7 king-move adjacent elements, with upper left element zero. 2
1, 3, 9, 10, 27, 109, 168, 349, 1229, 2490, 4767, 14401, 33504, 66377, 175249, 433386, 909235, 2208549, 5522840, 12201285, 28458341, 70294586, 161026423, 370622297, 898784848, 2102285073, 4841334921, 11557476010, 27287134763, 63194732573 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 2 of A305097.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +a(n-2) +8*a(n-3) -16*a(n-5) for n>6

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A305097.

Sequence in context: A326003 A060140 A025616 * A282635 A308084 A136852

Adjacent sequences:  A305088 A305089 A305090 * A305092 A305093 A305094

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 25 2018

STATUS

approved

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Last modified November 12 07:03 EST 2019. Contains 329052 sequences. (Running on oeis4.)