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A221331 Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2 1
1, 577, 33873, 2460824, 162430981, 10794156688, 711858713069, 46910596287335, 3089778765626866, 203426990390736036, 13389504827335440162, 881130781309712234876, 57978558022828544235124, 3814742757245230038689495 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Row 4 of A221328
LINKS
EXAMPLE
Some solutions for n=3
..2..0..1....1..2..0....2..1..1....1..1..1....1..1..0....2..0..1....1..1..2
..2..2..0....1..1..0....1..0..0....1..0..2....2..0..0....0..2..1....1..2..1
..1..0..2....1..1..0....1..2..0....0..2..0....2..2..1....1..2..1....0..1..2
..0..2..0....1..2..2....0..2..2....1..2..1....1..0..2....1..1..0....0..0..1
CROSSREFS
Sequence in context: A157264 A201046 A154511 * A163042 A069365 A163053
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 11 2013
STATUS
approved

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Last modified March 3 06:28 EST 2024. Contains 370499 sequences. (Running on oeis4.)