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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.

A229417 T(n,k) = number of n X n 0..k zero-diagonal arrays with corresponding row and column sums equal.

Table of values

n a(n)
1 1
2 1
3 2
4 1
5 3
6 10
7 1
8 4
9 45
10 152
11 1
12 5
13 136
14 4743
15 7736
16 1
17 6
18 325
19 59008
20 3801411
21 1375952
22 1
23 7
24 666
25 426425
26 345706336
27 23938685973
28 877901648
29 1
30 8
31 1225
32 2164680
33 11782824375
34 28256240134144
35 1215663478473627
36 2046320373120
37 1
38 9
39 2080

List of values

[1, 1, 2, 1, 3, 10, 1, 4, 45, 152, 1, 5, 136, 4743, 7736, 1, 6, 325, 59008, 3801411, 1375952, 1, 7, 666, 426425, 345706336, 23938685973, 877901648, 1, 8, 1225, 2164680, 11782824375, 28256240134144, 1215663478473627, 2046320373120, 1, 9, 2080]