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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A269562 Array read by antidiagonals: T(n,m) is the number of Hamiltonian cycles in the rook graph K_n X K_m.

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 1
6 1
7 3
8 3
9 3
10 3
11 12
12 30
13 48
14 30
15 12
16 60
17 480
18 1566
19 1566
20 480
21 60
22 360
23 12000
24 126120
25 284112
26 126120
27 12000
28 360
29 2520
30 430920
31 18153720
32 122330880
33 122330880
34 18153720
35 430920
36 2520
37 20160
38 21052080
39 4357332000
40 112777827840
41 335750676480
42 112777827840
43 4357332000
44 21052080
45 20160

List of values

[0, 0, 0, 1, 1, 1, 3, 3, 3, 3, 12, 30, 48, 30, 12, 60, 480, 1566, 1566, 480, 60, 360, 12000, 126120, 284112, 126120, 12000, 360, 2520, 430920, 18153720, 122330880, 122330880, 18153720, 430920, 2520, 20160, 21052080, 4357332000, 112777827840, 335750676480, 112777827840, 4357332000, 21052080, 20160]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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