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.

A185355 Number of n X n symmetric (0,1)-matrices containing four ones.

Table of values

n a(n)
1 0
2 1
3 12
4 52
5 150
6 345
7 686
8 1232
9 2052
10 3225
11 4840
12 6996
13 9802
14 13377
15 17850
16 23360
17 30056
18 38097
19 47652
20 58900
21 72030
22 87241
23 104742
24 124752
25 147500
26 173225
27 202176
28 234612
29 270802
30 311025
31 355570
32 404736
33 458832
34 518177
35 583100
36 653940
37 731046
38 814777

List of values

[0, 1, 12, 52, 150, 345, 686, 1232, 2052, 3225, 4840, 6996, 9802, 13377, 17850, 23360, 30056, 38097, 47652, 58900, 72030, 87241, 104742, 124752, 147500, 173225, 202176, 234612, 270802, 311025, 355570, 404736, 458832, 518177, 583100, 653940, 731046, 814777]