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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.

A381880 Expansion of (1/x) * Series_Reversion( x * (1-x)^3 / C(x) ), where C(x) is the g.f. of A000108.

Table of values

n a(n)
0 1
1 4
2 27
3 223
4 2052
5 20199
6 208205
7 2219149
8 24261279
9 270581313
10 3066581130
11 35216499786
12 408919039968
13 4792955710138
14 56633333886618
15 673881539636365
16 8067939162382594
17 97117925556632184
18 1174721577627568371
19 14270877151754826473
20 174044527062280321368

List of values

[1, 4, 27, 223, 2052, 20199, 208205, 2219149, 24261279, 270581313, 3066581130, 35216499786, 408919039968, 4792955710138, 56633333886618, 673881539636365, 8067939162382594, 97117925556632184, 1174721577627568371, 14270877151754826473, 174044527062280321368]

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

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