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 A189247 Number of n X 2 array permutations with each element making zero or one king moves 2
 2, 24, 152, 1168, 8448, 62272, 456320, 3350016, 24579584, 180376576, 1323614208, 9712930816, 71274930176, 523026923520, 3838053810176, 28164247060480, 206673697308672, 1516604287614976, 11129082140426240, 81666965136998400 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A189254. LINKS R. H. Hardin, Table of n, a(n) for n = 1..200 FORMULA Empirical: a(n) = 6*a(n-1) + 12*a(n-2) - 16*a(n-3). Empirical g.f.: 2*x*(1 + 6*x - 8*x^2) / (1 - 6*x - 12*x^2 + 16*x^3). - Colin Barker, Mar 01 2018 EXAMPLE Some solutions for 3 X 2: ..1..2....1..2....1..2....3..1....0..1....1..0....0..2....2..0....2..1....0..1 ..0..3....0..4....3..0....5..0....4..2....3..2....3..1....5..1....3..0....3..5 ..5..4....5..3....4..5....4..2....3..5....5..4....4..5....4..3....4..5....2..4 CROSSREFS Cf. A189254. Sequence in context: A264566 A163752 A035600 * A234352 A241623 A288443 Adjacent sequences:  A189244 A189245 A189246 * A189248 A189249 A189250 KEYWORD nonn AUTHOR R. H. Hardin, Apr 19 2011 STATUS approved

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Last modified July 16 04:26 EDT 2019. Contains 325064 sequences. (Running on oeis4.)