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A297810 Number of nX4 0..1 arrays with every element equal to 2 or 3 king-move adjacent elements, with upper left element zero. 1
0, 1, 2, 8, 13, 27, 41, 100, 208, 450, 898, 1871, 3889, 8201, 17095, 35607, 74032, 154537, 322580, 673283, 1403752, 2927384, 6106043, 12739513, 26576048, 55436430, 115633960, 241213607, 503185198, 1049671378, 2189629220, 4567589342 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 4 of A297814.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +2*a(n-2) +3*a(n-4) +2*a(n-5) -4*a(n-6) -11*a(n-7) -11*a(n-8) -6*a(n-9) +a(n-10) +6*a(n-11) +5*a(n-12) -a(n-14) for n>21

EXAMPLE

Some solutions for n=7

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

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

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

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

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

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

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

CROSSREFS

Cf. A297814.

Sequence in context: A193666 A196024 A037382 * A298142 A095825 A106359

Adjacent sequences:  A297807 A297808 A297809 * A297811 A297812 A297813

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2018

STATUS

approved

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Last modified August 4 13:52 EDT 2021. Contains 346447 sequences. (Running on oeis4.)