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 A221135 Number of nX4 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2 1
 4, 289, 12544, 643204, 31203396, 1539699121, 75512292025, 3709710975721, 182118668668225, 8941989810789025, 439009303948483984, 21553427021714858449, 1058163003670012270144, 51950295646215686851681 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A221139 LINKS R. H. Hardin, Table of n, a(n) for n = 1..23 EXAMPLE Some solutions for n=3 ..2..2..2..1....2..1..1..1....1..2..2..0....0..1..2..0....2..2..1..0 ..1..0..1..1....2..1..0..1....1..0..1..2....2..2..1..0....0..1..1..1 ..1..0..0..1....0..2..1..0....1..1..0..1....0..1..2..1....1..2..0..1 CROSSREFS Sequence in context: A090088 A253233 A242997 * A110816 A112322 A281535 Adjacent sequences: A221132 A221133 A221134 * A221136 A221137 A221138 KEYWORD nonn AUTHOR R. H. Hardin Jan 02 2013 STATUS approved

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Last modified February 26 07:39 EST 2024. Contains 370335 sequences. (Running on oeis4.)