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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.

A202669 G.f. satisfies: A(x) = exp( Sum_{n>=1} (A(x) + (-1)^n)^n * x^n/n ).

Table of values

n a(n)
0 1
1 0
2 2
3 2
4 12
5 20
6 96
7 212
8 898
9 2354
10 9266
11 27070
12 102094
13 319930
14 1177838
15 3865762
16 14050948
17 47574460
18 171886784
19 594572676
20 2143957648
21 7528825924
22 27156892364
23 96412294088
24 348314869652
25 1246689890248
26 4513958859208
27 16257651642036
28 59010423148052
29 213586733348928

List of values

[1, 0, 2, 2, 12, 20, 96, 212, 898, 2354, 9266, 27070, 102094, 319930, 1177838, 3865762, 14050948, 47574460, 171886784, 594572676, 2143957648, 7528825924, 27156892364, 96412294088, 348314869652, 1246689890248, 4513958859208, 16257651642036, 59010423148052, 213586733348928]

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

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