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A186135 Number of (n+1)X4 0..2 arrays with no 2X2 subblock trace equal to any horizontal or vertical neighbor 2X2 subblock trace 1
3888, 107874, 3090564, 88110594, 2513594016, 71683161894, 2044563391476, 58311925687818, 1663128694130598, 47433932055670734, 1352865880643114214, 38585070116572714902, 1100485517204049090894, 31386952148587046019792 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A186141

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n)=8*a(n-1)+551*a(n-2)+2092*a(n-3)-29959*a(n-4)-80288*a(n-5)+807333*a(n-6)+327072*a(n-7)-9377682*a(n-8)+9809631*a(n-9)+37995967*a(n-10)-77988412*a(n-11)-25468024*a(n-12)+142020278*a(n-13)-6381828*a(n-14)-124693659*a(n-15)-23375996*a(n-16)+64568471*a(n-17)+52421184*a(n-18)-6894001*a(n-19)-26781500*a(n-20)-12165465*a(n-21)+158720*a(n-22)+3261613*a(n-23)+1589010*a(n-24)+560063*a(n-25)+355508*a(n-26)+79536*a(n-27)+6024*a(n-28)+5184*a(n-29) for n>30

EXAMPLE

Some solutions for 3X4

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

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

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

CROSSREFS

Sequence in context: A014891 A253484 A253479 * A223597 A223438 A223690

Adjacent sequences:  A186132 A186133 A186134 * A186136 A186137 A186138

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 13 2011

STATUS

approved

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Last modified September 20 06:32 EDT 2021. Contains 347577 sequences. (Running on oeis4.)