A259985 Triangle read by rows: coefficients of rook polynomials.

1, 1, 1, 1, 4, 2, 1, 9, 18, 6, 1, 16, 72, 96, 24, 1, 20, 130, 320, 265, 44, 1, 24, 204, 752, 1185, 672, 80, 1, 28, 294, 1456, 3521, 3892, 1617, 144, 1, 32, 400, 2496, 8264, 14272, 11776, 3776, 264, 1, 36, 522, 3936, 16659, 39924, 52071, 33480, 8577, 484, 1, 40, 660, 5840, 30210, 93568, 171060, 175360, 90745, 19080, 888, 1, 44, 814, 8272, 50677, 193556, 461208, 667832, 554532, 236808, 41745, 1632

Offset: 0

Author

N. J. A. Sloane, Jul 13 2015

Keywords

• nonn
• tabl

Examples

			Triangle begins:
1;
1,  1;
1,  4,  2;
1,  9,  18,    6;
1, 16,  72,   96,    24;
1, 20, 130,  320,   265,    44;
1, 24, 204,  752,  1185,   672,     80;
1, 28, 294, 1456,  3521,  3892,   1617,    144;
1, 32, 400, 2496,  8264, 14272,  11776,   3776,   264;
1, 36, 522, 3936, 16659, 39924,  52071,  33480,  8577,   484;
1, 40, 660, 5840, 30210, 93568, 171060, 175360, 90745, 19080, 888; ...
		

Links

• Earl Glen Whitehead, Jr., Four-discordant permutations, J. Austral. Math. Soc. Ser. A 28 (1979), no. 3, 369-377.
• Earl Glen Whitehead, Jr., Four-discordant permutations (Table 1) (Annotated scanned table)

Crossrefs

Diagonals give A004306, A005777, A005778.