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 A221901 Number of 4 X n arrays of occupancy after each element stays put or moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out straight through or left turns. 0
 13, 2305, 235332, 25821731, 2815434576, 307126807101, 33499434763000, 3654072363322660, 398576690257243663, 43475776796985596792, 4742231413650315959473 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 4 of A221898. LINKS EXAMPLE Some solutions for n=3 ..1..0..1....0..2..0....0..1..2....0..2..1....0..0..2....0..0..0....0..2..1 ..0..3..2....1..1..2....2..0..1....2..0..1....4..0..0....2..2..2....1..1..0 ..1..0..1....0..0..3....1..0..2....0..2..4....1..0..0....1..0..0....2..2..2 ..2..0..1....2..1..0....0..3..0....0..0..0....0..5..0....2..1..2....0..0..1 CROSSREFS Cf. A221898. Sequence in context: A270872 A141077 A202517 * A096721 A301466 A229267 Adjacent sequences: A221898 A221899 A221900 * A221902 A221903 A221904 KEYWORD nonn AUTHOR R. H. Hardin Jan 30 2013 STATUS approved

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Last modified November 27 13:59 EST 2022. Contains 358405 sequences. (Running on oeis4.)