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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.

A381881 Expansion of (1/x) * Series_Reversion( x / ((1+x)^2 * C(x)) ), where C(x) is the g.f. of A000108.

Table of values

n a(n)
0 1
1 3
2 14
3 82
4 547
5 3958
6 30249
7 240362
8 1966235
9 16449495
10 140093989
11 1210575512
12 10587490383
13 93540456103
14 833619150838
15 7484887130882
16 67645312129491
17 614872423359187
18 5617522739173495
19 51556112664387720
20 475105557839611760
21 4394434006611790855

List of values

[1, 3, 14, 82, 547, 3958, 30249, 240362, 1966235, 16449495, 140093989, 1210575512, 10587490383, 93540456103, 833619150838, 7484887130882, 67645312129491, 614872423359187, 5617522739173495, 51556112664387720, 475105557839611760, 4394434006611790855]

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

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