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A251526
Number of ways to place any number of black and any number of white nonattacking knights on a (n+2)X(1+2) board
1
3465, 30377, 318659, 3222565, 31361437, 307927905, 3055869419, 30236761389, 298577465957, 2950327719065, 29170975532007, 288360297088757, 2850205052528725, 28173293046232005, 278493129973163419
OFFSET
1,1
COMMENTS
Column 1 of A251531
FORMULA
Empirical recurrence of order 57 (see link above)
EXAMPLE
Some solutions for n=2
..0..0..2....2..1..2....1..0..0....2..2..2....2..2..0....2..0..0....0..1..1
..2..2..0....2..0..0....2..2..1....0..0..2....2..1..0....0..0..2....0..1..0
..0..0..2....0..2..0....1..0..2....2..2..0....0..2..0....0..0..0....0..0..0
..0..0..2....0..2..2....2..0..0....1..0..0....0..2..1....1..2..2....0..0..1
CROSSREFS
Sequence in context: A307111 A307098 A251531 * A325979 A251525 A176268
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 04 2014
STATUS
approved