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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.

A227619 G.f.: A(x) = 1+x + Sum_{n>=2} (A(x)^n - 1)^n.

Table of values

n a(n)
0 1
1 1
2 4
3 63
4 1278
5 29764
6 758065
7 20611793
8 590579518
9 17707907024
10 553879330720
11 18066513887790
12 615744470668778
13 22014659625607877
14 830262409494773896
15 33243718957578687811
16 1422095813097928147636
17 65311403344808947050730
18 3227884786251446164710376

List of values

[1, 1, 4, 63, 1278, 29764, 758065, 20611793, 590579518, 17707907024, 553879330720, 18066513887790, 615744470668778, 22014659625607877, 830262409494773896, 33243718957578687811, 1422095813097928147636, 65311403344808947050730, 3227884786251446164710376]

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

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