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A187294
Number of 9-step one or two space at a time rook's tours on an n X n board summed over all starting positions.
1
0, 0, 1512, 345120, 3123680, 11693984, 28716816, 55430032, 92058752, 138378368, 194130148, 259136336, 333313864, 416629232, 509072912, 610642384, 721337268, 841157504, 970103092, 1108174032, 1255370324, 1411691968, 1577138964
OFFSET
1,3
COMMENTS
Row 9 of A187286.
LINKS
FORMULA
Empirical: a(n) = 4562676*n^2 - 39873424*n + 80572112 for n>15.
CROSSREFS
Cf. A187286.
Sequence in context: A022059 A134614 A134613 * A107523 A282253 A368545
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 08 2011
STATUS
approved