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A229368 Number of nX4 0..2 arrays avoiding 11 horizontally, 22 vertically and 00 antidiagonally 1
60, 869, 13937, 222990, 3576912, 56939585, 911301584, 14532090528, 232232172607, 3706745079815, 59203178820148, 945256319974208, 15094878048962231, 241030410158025724, 3848864771555252792, 61458856647843842612 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A229372

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +257*a(n-2) +433*a(n-3) -16073*a(n-4) -20963*a(n-5) +481391*a(n-6) +119200*a(n-7) -7182420*a(n-8) +4731824*a(n-9) +44618241*a(n-10) -29900281*a(n-11) -162825007*a(n-12) +45010518*a(n-13) +361117327*a(n-14) +96538808*a(n-15) -378171592*a(n-16) -303446432*a(n-17) +22354064*a(n-18) +83608448*a(n-19) +6923904*a(n-20) -10505152*a(n-21) -433920*a(n-22) +664576*a(n-23) -65536*a(n-24) for n>25

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A008357 A259539 A138898 * A305625 A056321 A056312

Adjacent sequences:  A229365 A229366 A229367 * A229369 A229370 A229371

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 21 2013

STATUS

approved

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Last modified January 29 14:07 EST 2020. Contains 331338 sequences. (Running on oeis4.)