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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.

A174689 Triangle T(n, k) = n! * binomial(n, k)^2 - n! + 1, read by rows.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 7
5 1
6 1
7 49
8 49
9 1
10 1
11 361
12 841
13 361
14 1
15 1
16 2881
17 11881
18 11881
19 2881
20 1
21 1
22 25201
23 161281
24 287281
25 161281
26 25201
27 1
28 1
29 241921
30 2217601
31 6168961
32 6168961
33 2217601
34 241921
35 1
36 1
37 2540161
38 31570561
39 126403201
40 197527681
41 126403201
42 31570561
43 2540161
44 1

List of values

[1, 1, 1, 1, 7, 1, 1, 49, 49, 1, 1, 361, 841, 361, 1, 1, 2881, 11881, 11881, 2881, 1, 1, 25201, 161281, 287281, 161281, 25201, 1, 1, 241921, 2217601, 6168961, 6168961, 2217601, 241921, 1, 1, 2540161, 31570561, 126403201, 197527681, 126403201, 31570561, 2540161, 1]

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

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