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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.

A157114 Triangle T(n, k) = binomial(n*k, n-k) + binomial(n*(n-k), k), read by rows.

Table of values

n a(n)
0 2
1 1
2 1
3 1
4 4
5 1
6 1
7 9
8 9
9 1
10 1
11 16
12 56
13 16
14 1
15 1
16 25
17 225
18 225
19 25
20 1
21 1
22 36
23 771
24 1632
25 771
26 36
27 1
28 1
29 49
30 2597
31 9261
32 9261
33 2597
34 49
35 1
36 1
37 64
38 9136
39 52384
40 71920
41 52384
42 9136
43 64
44 1
45 1
46 81
47 33777
48 320814
49 525987
50 525987
51 320814
52 33777
53 81
54 1
55 1
56 100
57 129130
58 2090540
59 4326015
60 4237520
61 4326015
62 2090540
63 129130
64 100
65 1

List of values

[2, 1, 1, 1, 4, 1, 1, 9, 9, 1, 1, 16, 56, 16, 1, 1, 25, 225, 225, 25, 1, 1, 36, 771, 1632, 771, 36, 1, 1, 49, 2597, 9261, 9261, 2597, 49, 1, 1, 64, 9136, 52384, 71920, 52384, 9136, 64, 1, 1, 81, 33777, 320814, 525987, 525987, 320814, 33777, 81, 1, 1, 100, 129130, 2090540, 4326015, 4237520, 4326015, 2090540, 129130, 100, 1]