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A269139 Number of nX4 0..3 arrays with some element plus some horizontally, antidiagonally or vertically adjacent neighbor totalling three no more than once. 1
216, 8532, 275796, 8317996, 240647068, 6766301156, 186315931804, 5049212790572, 135126561336764, 3579710280903028, 94040960852579428, 2453204481574556084, 63613980689923027716, 1641094486943583990844, 42147014968744168530996 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A269143.

LINKS

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

FORMULA

Empirical: a(n) = 58*a(n-1) -1093*a(n-2) +7680*a(n-3) -27078*a(n-4) +58958*a(n-5) -88914*a(n-6) +82212*a(n-7) -35159*a(n-8) -20796*a(n-9) +39556*a(n-10) -11364*a(n-11) -13593*a(n-12) +9618*a(n-13) +429*a(n-14) -2060*a(n-15) +434*a(n-16) +166*a(n-17) -92*a(n-18) +16*a(n-19) -a(n-20) for n>22

EXAMPLE

Some solutions for n=2

..2..3..2..2. .2..3..1..3. .0..0..1..1. .1..1..3..1. .1..1..0..1

..2..2..2..3. .3..1..1..2. .0..1..1..0. .0..1..3..3. .0..1..1..3

CROSSREFS

Cf. A269143.

Sequence in context: A223272 A265845 A131643 * A231319 A269197 A259831

Adjacent sequences:  A269136 A269137 A269138 * A269140 A269141 A269142

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 20 2016

STATUS

approved

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Last modified October 1 00:54 EDT 2020. Contains 337440 sequences. (Running on oeis4.)