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A281983 Number of nX3 0..1 arrays with no element unequal to more than four of its king-move neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards. 1
0, 2, 121, 1054, 7053, 41118, 226025, 1189600, 6090935, 30538028, 150719259, 734621288, 3544728240, 16962264274, 80602719361, 380741691862, 1789303173765, 8371399843188, 39012925707604, 181180019619130, 838816233474674 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A281988.

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) +5*a(n-2) -48*a(n-3) -41*a(n-4) +76*a(n-5) +53*a(n-6) -94*a(n-7) +35*a(n-8) +188*a(n-9) -90*a(n-10) -98*a(n-11) +106*a(n-12) +22*a(n-13) -182*a(n-14) +60*a(n-15) +8*a(n-16) -72*a(n-17) +12*a(n-18) -9*a(n-20) for n>23

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A281988.

Sequence in context: A100012 A337989 A042799 * A217023 A332112 A074490

Adjacent sequences: A281980 A281981 A281982 * A281984 A281985 A281986

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 04 2017

STATUS

approved

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Last modified November 28 05:56 EST 2022. Contains 358407 sequences. (Running on oeis4.)