cp's OEIS Frontend

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.

A195644 T(n,k) is the number of lower triangles of an n X n 0..k array with all row sums equal to the length of the row and all column sums equal to the length of the column.

Table of values

n a(n)
1 1
2 1
3 1
4 1
5 1
6 1
7 1
8 1
9 3
10 1
11 1
12 1
13 3
14 15
15 1
16 1
17 1
18 3
19 19
20 199
21 1
22 1
23 1
24 3
25 19
26 379
27 6247
28 1
29 1
30 1
31 3
32 19
33 391
34 22506
35 505623
36 1
37 1
38 1
39 3
40 19
41 391
42 25428
43 4063437
44 105997283
45 1
46 1
47 1
48 3
49 19
50 391
51 25532
52 5422820
53 2303397986
54 58923059879
55 1
56 1
57 1
58 3
59 19
60 391
61 25532
62 5536654

List of values

[1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 3, 15, 1, 1, 1, 3, 19, 199, 1, 1, 1, 3, 19, 379, 6247, 1, 1, 1, 3, 19, 391, 22506, 505623, 1, 1, 1, 3, 19, 391, 25428, 4063437, 105997283, 1, 1, 1, 3, 19, 391, 25532, 5422820, 2303397986, 58923059879, 1, 1, 1, 3, 19, 391, 25532, 5536654]