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A305525 Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero. 1
4, 30, 161, 880, 4779, 26000, 141474, 769617, 4187055, 22779608, 123930190, 674233423, 3668120119, 19956134787, 108569904387, 590666693724, 3213479157579, 17482699850936, 95113358094319, 517457311408764 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A305530.

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) +2*a(n-2) +10*a(n-3) -44*a(n-4) +4*a(n-5) +18*a(n-6) +2*a(n-7) -26*a(n-8) -27*a(n-9) -12*a(n-10) -3*a(n-11)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A305530.

Sequence in context: A305764 A317113 A123351 * A316999 A217213 A119697

Adjacent sequences:  A305522 A305523 A305524 * A305526 A305527 A305528

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 04 2018

STATUS

approved

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Last modified October 25 11:29 EDT 2021. Contains 348251 sequences. (Running on oeis4.)