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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.

A330020 Expansion of e.g.f. Sum_{k>=1} x^k / (k! * (1 - x^k)^k).

Table of values

n a(n)
1 1
2 3
3 7
4 49
5 121
6 2161
7 5041
8 127681
9 725761
10 12852001
11 39916801
12 2917918081
13 6227020801
14 392423391361
15 4740319584001
16 122053759027201
17 355687428096001
18 57808258040332801
19 121645100408832001
20 18854997267794688001
21 289799177540640768001
22 7306005040298918553601

List of values

[1, 3, 7, 49, 121, 2161, 5041, 127681, 725761, 12852001, 39916801, 2917918081, 6227020801, 392423391361, 4740319584001, 122053759027201, 355687428096001, 57808258040332801, 121645100408832001, 18854997267794688001, 289799177540640768001, 7306005040298918553601]

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

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