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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.

A047793 a(n) = Sum_{k=0..n} |Stirling1(n,k)*Stirling2(n,k)|.

Table of values

n a(n)
0 1
1 1
2 2
3 12
4 120
5 1750
6 34615
7 882868
8 28008694
9 1076404824
10 49100939538
11 2615329877358
12 160486317081673
13 11218516998346216
14 884855465842682269
15 78106000651400369100
16 7660758993518625156050
17 829683453926089044978468

List of values

[1, 1, 2, 12, 120, 1750, 34615, 882868, 28008694, 1076404824, 49100939538, 2615329877358, 160486317081673, 11218516998346216, 884855465842682269, 78106000651400369100, 7660758993518625156050, 829683453926089044978468]

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

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