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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.

A373683 Expansion of e.g.f. exp(x / (1 - x^2)) / (1 - x^2).

Table of values

n a(n)
0 1
1 1
2 3
3 13
4 61
5 441
6 3031
7 28813
8 267513
9 3088081
10 36278731
11 491262861
12 6962025973
13 108395586313
14 1791145742751
15 31601369155021
16 594291393830641
17 11740929829286433
18 246910933786777363
19 5406641472165854221
20 125497950720670828461
21 3018786042678264770521

List of values

[1, 1, 3, 13, 61, 441, 3031, 28813, 267513, 3088081, 36278731, 491262861, 6962025973, 108395586313, 1791145742751, 31601369155021, 594291393830641, 11740929829286433, 246910933786777363, 5406641472165854221, 125497950720670828461, 3018786042678264770521]

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

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