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A268626 Number of nX6 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once. 1
336, 8586, 187224, 3819654, 74914554, 1430057208, 26758514760, 493042858032, 8974328440044, 161737670836314, 2891047134413940, 51321708535136676, 905714517532142694, 15902932976899644264, 277998507169027800234 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A268628.

LINKS

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

FORMULA

Empirical: a(n) = 60*a(n-1) -1482*a(n-2) +20016*a(n-3) -167163*a(n-4) +924894*a(n-5) -3537110*a(n-6) +9593166*a(n-7) -18693789*a(n-8) +26218062*a(n-9) -26188161*a(n-10) +18139608*a(n-11) -8262712*a(n-12) +2220864*a(n-13) -266256*a(n-14) for n>15

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Cf. A268628.

Sequence in context: A337875 A223446 A229697 * A258418 A268969 A056933

Adjacent sequences:  A268623 A268624 A268625 * A268627 A268628 A268629

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 09 2016

STATUS

approved

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Last modified January 27 22:35 EST 2022. Contains 350654 sequences. (Running on oeis4.)