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 A277653 Number of n X 2 0..2 arrays with every element equal to some element at offset (-1,0) (-1,1) (0,-1) (0,1) or (1,0) both plus 1 mod 3 and minus 1 mod 3, with new values introduced in order 0..2. 1
 0, 0, 1, 2, 8, 28, 98, 346, 1218, 4290, 15110, 53218, 187438, 660170, 2325166, 8189402, 28843662, 101589450, 357805342, 1260216122, 4438571726, 15632968522, 55060438334, 193926819802, 683024192622, 2405660280426, 8472908349854 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 3*a(n-1) + 2*a(n-2) - 2*a(n-4). Empirical g.f.: x^3*(1 - x) / (1 - 3*x - 2*x^2 + 2*x^4). - Colin Barker, Feb 05 2019 EXAMPLE All solutions for n=4: ..0..1. .0..1 ..2..2. .2..2 ..1..0. .1..0 ..1..2. .2..1 CROSSREFS Column 2 of A277659. Sequence in context: A106731 A318010 A291383 * A066796 A104934 A056711 Adjacent sequences:  A277650 A277651 A277652 * A277654 A277655 A277656 KEYWORD nonn AUTHOR R. H. Hardin, Oct 26 2016 STATUS approved

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Last modified April 14 03:45 EDT 2021. Contains 342941 sequences. (Running on oeis4.)