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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.

A383203 Expansion of e.g.f. f(x) * exp(f(x)), where f(x) = (exp(2*x) - 1)/2.

Table of values

n a(n)
0 0
1 1
2 4
3 19
4 104
5 641
6 4380
7 32803
8 266768
9 2337505
10 21925236
11 218946003
12 2316939256
13 25878593313
14 304020964876
15 3745210267939
16 48248600421664
17 648460085178689
18 9072650530778084
19 131884007007981075
20 1988341404357799048
21 31040812899065995073
22 501049583881525932028

List of values

[0, 1, 4, 19, 104, 641, 4380, 32803, 266768, 2337505, 21925236, 218946003, 2316939256, 25878593313, 304020964876, 3745210267939, 48248600421664, 648460085178689, 9072650530778084, 131884007007981075, 1988341404357799048, 31040812899065995073, 501049583881525932028]

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

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