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A221348 Number of nX3 arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without 2-loops 1
0, 18, 370, 6893, 122690, 2152076, 37541550, 653557217, 11369057766, 197715942522, 3438053202520, 59781409121813, 1039472974649122, 18074147498877660, 314268989617804842, 5464430347020252629 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 3 of A221351
LINKS
FORMULA
Empirical: a(n) = 26*a(n-1) -162*a(n-2) +198*a(n-3) +305*a(n-4) -794*a(n-5) +668*a(n-6) -244*a(n-7) +72*a(n-8)
EXAMPLE
Some solutions for n=3
..1..3..1....1..1..0....0..1..1....0..2..1....1..1..0....1..1..0....0..3..1
..0..1..1....0..2..1....1..4..0....1..4..1....0..4..2....1..2..1....1..3..1
..0..2..0....0..3..1....1..1..0....0..0..0....0..1..0....0..3..0....0..0..0
CROSSREFS
Sequence in context: A086502 A259459 A099276 * A285400 A324431 A070943
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 11 2013
STATUS
approved

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Last modified July 21 09:16 EDT 2024. Contains 374472 sequences. (Running on oeis4.)