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A185610 Number of (n+1)X2 0..2 arrays with every 2X2 subblock sum equal to some horizontal or vertical neighbor 2X2 subblock sum 2
0, 171, 361, 3645, 13365, 94905, 424845, 2682129, 13079349, 78537465, 399963789, 2339595729, 12218349285, 70347244905, 373332026493, 2126782533537, 11410731148437, 64515747347865, 348826307822253, 1961330707376721 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 1 of A185614

LINKS

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

FORMULA

Empirical: a(n)=6*a(n-1)+18*a(n-2)-159*a(n-3)+338*a(n-4)-48*a(n-5)-3888*a(n-6)+11346*a(n-7)-26856*a(n-8)+39504*a(n-9)+24264*a(n-10)-101520*a(n-11)+746208*a(n-12)-1142208*a(n-13)+3229632*a(n-14)-3297024*a(n-15)+5474304*a(n-16)-2985984*a(n-17)+2985984*a(n-18)

EXAMPLE

Some solutions for 3X2

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

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

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

CROSSREFS

Sequence in context: A062907 A266315 A116459 * A185837 A016057 A043407

Adjacent sequences:  A185607 A185608 A185609 * A185611 A185612 A185613

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 31 2011

STATUS

approved

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Last modified November 16 19:17 EST 2019. Contains 329201 sequences. (Running on oeis4.)