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

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

R. H. Hardin, Table of n, a(n) for n = 1..50

Formula

Empirical: a(n) = 4562676*n^2 - 39873424*n + 80572112 for n>15

Crossrefs

Sequence in context: A022059 A134614 A134613 * A107523 A282253 A368545

Adjacent sequences: A187291 A187292 A187293 * A187295 A187296 A187297

Keyword

nonn

Author

R. H. Hardin Mar 08 2011

Status

approved