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A281930 Number of nX2 0..1 arrays with no element equal to more than four of its king-move neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. 1
0, 0, 1, 6, 33, 166, 792, 3654, 16455, 72774, 317367, 1368608, 5848140, 24799548, 104488541, 437818374, 1825747245, 7581746154, 31368531456, 129358242306, 531886946515, 2181210602118, 8923564277475, 36428064156772, 148413344768244 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Column 2 of A281936.

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) -3*a(n-2) -14*a(n-3) -21*a(n-4) -12*a(n-5) -4*a(n-6)

EXAMPLE

All solutions for n=4

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

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

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

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

CROSSREFS

Cf. A281936.

Sequence in context: A240880 A099432 A072260 * A282371 A291004 A203155

Adjacent sequences:  A281927 A281928 A281929 * A281931 A281932 A281933

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 02 2017

STATUS

approved

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Last modified October 17 06:27 EDT 2018. Contains 316276 sequences. (Running on oeis4.)