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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.

A144441 Triangle T(n,k) read by rows: T(n, k) = (4*n-4*k+1)*T(n-1, k-1) + (4*k-3)*T(n-1, k) + 4*T(n-2, k-1) with T(n, 1) = T(n, n) = 1.

Table of values

n a(n)
1 1
2 1
3 1
4 1
5 14
6 1
7 1
8 83
9 83
10 1
11 1
12 432
13 1550
14 432
15 1
16 1
17 2181
18 19898
19 19898
20 2181
21 1
22 1
23 10930
24 217887
25 523548
26 217887
27 10930
28 1
29 1
30 54679
31 2199237
32 10589795
33 10589795
34 2199237
35 54679
36 1
37 1
38 273428
39 21203828
40 184722860
41 362147222
42 184722860
43 21203828
44 273428
45 1

List of values

[1, 1, 1, 1, 14, 1, 1, 83, 83, 1, 1, 432, 1550, 432, 1, 1, 2181, 19898, 19898, 2181, 1, 1, 10930, 217887, 523548, 217887, 10930, 1, 1, 54679, 2199237, 10589795, 10589795, 2199237, 54679, 1, 1, 273428, 21203828, 184722860, 362147222, 184722860, 21203828, 273428, 1]

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