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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.

A355488 Expansion of g.f. f/(1+2*f) where f is the g.f. of nonempty permutations.

Table of values

n a(n)
0 0
1 1
2 0
3 2
4 8
5 48
6 328
7 2560
8 22368
9 216224
10 2291456
11 26430336
12 329805952
13 4429255168
14 63730438656
15 978479250944
16 15972310317056
17 276292865550336
18 5049672714569728
19 97245533647568896
20 1968395389124714496
21 41783552069858877440
22 928204423021249003520

List of values

[0, 1, 0, 2, 8, 48, 328, 2560, 22368, 216224, 2291456, 26430336, 329805952, 4429255168, 63730438656, 978479250944, 15972310317056, 276292865550336, 5049672714569728, 97245533647568896, 1968395389124714496, 41783552069858877440, 928204423021249003520]

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

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