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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.

A340474 a(n) = n! [x^n] LW(T(x)), where T(x) = -W(-x) Euler's tree function, W(x) is the Lambert W function, and LW(x) = W(-W(x))/(-W(x)) (A340473).

Table of values

n a(n)
0 1
1 1
2 3
3 22
4 209
5 2756
6 43717
7 839686
8 18581425
9 470707192
10 13352676101
11 420875581754
12 14566375690297
13 549877190829604
14 22472783629465093
15 989043215802778966
16 46631075599107558113
17 2345376059569552767344
18 125350843842721213505029
19 7095169059445749303612946

List of values

[1, 1, 3, 22, 209, 2756, 43717, 839686, 18581425, 470707192, 13352676101, 420875581754, 14566375690297, 549877190829604, 22472783629465093, 989043215802778966, 46631075599107558113, 2345376059569552767344, 125350843842721213505029, 7095169059445749303612946]

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

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