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A221508 Number of 2Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without consecutive moves in the same direction 1
0, 9, 44, 446, 3334, 27540, 219070, 1766136, 14168766, 113870162, 914550470, 7346946970, 59015933032, 474072774244, 3808166264624, 30590638905810, 245731343642532, 1973934759524284, 15856413036814582, 127372929035331130 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Row 2 of A221507
LINKS
EXAMPLE
Some solutions for n=3
..0..3..0....0..4..0....1..2..0....0..2..2....1..0..0....0..2..0....0..1..0
..1..1..1....1..0..1....1..2..0....0..2..0....0..4..1....1..2..1....0..3..2
CROSSREFS
Sequence in context: A104470 A282722 A084016 * A301397 A125679 A037207
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 18 2013
STATUS
approved

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Last modified February 23 04:31 EST 2024. Contains 370267 sequences. (Running on oeis4.)