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

Author

R. H. Hardin, Mar 08 2011

Keywords

• nonn

Comments

Row 9 of A187286.

Links

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

Crossrefs

Cf. A187286.

Formula

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