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A187194 Number of 7-turn rook's tours on an n X n board summed over all starting positions 0
0, 0, 2304, 156672, 2169600, 15220800, 72182880, 264520704, 806827392, 2144534400, 5120913600, 11222069760 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Row 7 of A187189

LINKS

Table of n, a(n) for n=1..12.

FORMULA

Empirical G.f.: -96*x^3*(287*x^5+4491*x^4+11886*x^3+8776*x^2+1416*x+24)/(x-1)^9. [Colin Barker, Jul 01 2012]

EXAMPLE

Some solutions for 3X3

..2..1..0....1..2..0....0..2..1....0..0..4....5..4..0....4..3..5....4..1..5

..3..6..7....6..0..7....5..3..4....1..2..3....6..0..7....7..1..6....0..7..6

..4..5..0....5..3..4....6..0..7....7..6..5....2..3..1....0..2..0....3..2..0

CROSSREFS

Sequence in context: A235419 A229698 A236280 * A170785 A259321 A223302

Adjacent sequences:  A187191 A187192 A187193 * A187195 A187196 A187197

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 06 2011

STATUS

approved

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Last modified January 17 12:18 EST 2020. Contains 330958 sequences. (Running on oeis4.)