A259985 - OEIS

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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

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

0,5

LINKS

Table of n, a(n) for n=0..77.

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)

EXAMPLE

Triangle begins:

1, 1;

1, 4, 2;

1, 9, 18, 6;