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A189651
Number of 3Xn array permutations with each element moving zero or one space horizontally, diagonally or antidiagonally
1
1, 32, 263, 4277, 55440, 799069, 11047585, 155610272, 2174615543, 30495310793, 427003730560, 5982947971505, 83805935210153, 1174054970088496, 16446690057231391, 230398085842470229, 3227563109360717136
OFFSET
1,2
COMMENTS
Row 3 of A189650
LINKS
FORMULA
Empirical: a(n) = 10*a(n-1) +75*a(n-2) -240*a(n-3) -399*a(n-4) +972*a(n-5) -1263*a(n-6) +482*a(n-7) +669*a(n-8) -100*a(n-9) -9*a(n-10)
EXAMPLE
Some solutions for 3X3
..1..5..2....1..0..2....4..0..2....0..2..1....0..2..4....0..1..2....1..0..4
..3..0..4....3..6..5....7..3..1....4..6..5....1..3..5....3..4..5....7..2..5
..7..6..8....4..7..8....6..5..8....7..3..8....7..6..8....7..6..8....6..3..8
CROSSREFS
Sequence in context: A022327 A318022 A320407 * A145711 A125369 A126527
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 24 2011
STATUS
approved