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 A221223 Number of n X 2 arrays of occupancy after each element stays put or moves to some king-move neighbor. 1
 3, 35, 400, 4525, 51025, 574800, 6473175, 72891475, 820773600, 9242002325, 104065684825, 1171786908400, 13194399201775, 148569807813675, 1672905820612800, 18837029565221725, 212106191270112225 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A221225. LINKS R. H. Hardin, Table of n, a(n) for n = 1..22 FORMULA Empirical: a(n) = 15*a(n-1) - 43*a(n-2) + 10*a(n-3). Empirical g.f.: x*(3 - 10*x + 4*x^2) / (1 - 15*x + 43*x^2 - 10*x^3). - Colin Barker, Aug 04 2018 EXAMPLE Some solutions for n=3: ..0..0....2..0....2..1....2..0....1..3....0..0....3..1....0..0....2..1....2..0 ..4..0....2..1....0..0....2..0....0..0....1..2....1..1....5..1....0..1....0..2 ..0..2....1..0....1..2....1..1....0..2....3..0....0..0....0..0....2..0....2..0 CROSSREFS Cf. A221225. Sequence in context: A086043 A221774 A221687 * A006767 A065929 A161495 Adjacent sequences: A221220 A221221 A221222 * A221224 A221225 A221226 KEYWORD nonn AUTHOR R. H. Hardin, Jan 05 2013 STATUS approved

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Last modified May 23 05:11 EDT 2024. Contains 372758 sequences. (Running on oeis4.)