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.

A139594 Number of different n X n symmetric matrices with nonnegative entries summing to 4. Also number of symmetric oriented graphs with 4 arcs on n points.

Table of values

n a(n)
0 0
1 1
2 9
3 39
4 116
5 275
6 561
7 1029
8 1744
9 2781
10 4225
11 6171
12 8724
13 11999
14 16121
15 21225
16 27456
17 34969
18 43929
19 54511
20 66900
21 81291
22 97889
23 116909
24 138576
25 163125
26 190801
27 221859
28 256564
29 295191
30 338025
31 385361
32 437504
33 494769
34 557481
35 625975
36 700596

List of values

[0, 1, 9, 39, 116, 275, 561, 1029, 1744, 2781, 4225, 6171, 8724, 11999, 16121, 21225, 27456, 34969, 43929, 54511, 66900, 81291, 97889, 116909, 138576, 163125, 190801, 221859, 256564, 295191, 338025, 385361, 437504, 494769, 557481, 625975, 700596]