A260583 - cp's OEIS frontend

A260583 Number of ways to place 3n rooks on an n X n board, 3 rooks in each row and each column, multiple rooks in an allowed cell, and exactly 4 rooks below the main diagonal.

n	a(n)
3	11
4	595
5	14679
6	253247
7	3564803
8	44226950
9	505572550
10	5473391465
11	57122380066
12	581477852342
13	5819301681925
14	57564437594318
15	564911137682637
16	5513703983635512
17	53616132982114742
18	520057429817203110
19	5035740328012627416
20	48704838658567681135

[11, 595, 14679, 253247, 3564803, 44226950, 505572550, 5473391465, 57122380066, 581477852342, 5819301681925, 57564437594318, 564911137682637, 5513703983635512, 53616132982114742, 520057429817203110, 5035740328012627416, 48704838658567681135]

cp's OEIS Frontend

A260583 Number of ways to place 3n rooks on an n X n board, 3 rooks in each row and each column, multiple rooks in an allowed cell, and exactly 4 rooks below the main diagonal.

Table of values

List of values