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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.

A380828 Expansion of e.g.f. (1/x) * Series_Reversion( x * exp(-2*x) / (1 + x) ).

Table of values

n a(n)
0 1
1 3
2 26
3 398
4 8904
5 264072
6 9790192
7 436382256
8 22748241024
9 1358633214080
10 91503397265664
11 6862436244211968
12 567252637423922176
13 51244493078278198272
14 5023312927780022323200
15 531082672018567209801728
16 60239691905397303186849792
17 7297357396264290237329473536

List of values

[1, 3, 26, 398, 8904, 264072, 9790192, 436382256, 22748241024, 1358633214080, 91503397265664, 6862436244211968, 567252637423922176, 51244493078278198272, 5023312927780022323200, 531082672018567209801728, 60239691905397303186849792, 7297357396264290237329473536]

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

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