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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.

A258662 E.g.f. A(x) satisfies: A(x) = exp( Integral A(x) * Integral 1/A(x)^2 dx dx ).

Table of values

n a(n)
0 1
1 1
2 4
3 40
4 760
5 23200
6 1038400
7 64081600
8 5214880000
9 541085248000
10 69718686400000
11 10921720817920000
12 2044231370959360000
13 450550323286412800000
14 115495483535461427200000
15 34070943029324134912000000
16 11460293146666575236608000000
17 4360020024970859812710400000000
18 1862768688935303816870072320000000

List of values

[1, 1, 4, 40, 760, 23200, 1038400, 64081600, 5214880000, 541085248000, 69718686400000, 10921720817920000, 2044231370959360000, 450550323286412800000, 115495483535461427200000, 34070943029324134912000000, 11460293146666575236608000000, 4360020024970859812710400000000, 1862768688935303816870072320000000]

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

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