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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.

A330444 a(n) = Sum_{k=1..n} Stirling2(n,k) * (k-1)! * phi(k), where phi = A000010.

Table of values

n a(n)
1 1
2 2
3 8
4 44
5 332
6 2852
7 28268
8 330164
9 4371452
10 62867492
11 980090828
12 16792404884
13 316446118172
14 6484254233732
15 142335512881388
16 3299266086185204
17 80092968046706492
18 2040940536907449572
19 55097942635383719948
20 1586719679112182359124

List of values

[1, 2, 8, 44, 332, 2852, 28268, 330164, 4371452, 62867492, 980090828, 16792404884, 316446118172, 6484254233732, 142335512881388, 3299266086185204, 80092968046706492, 2040940536907449572, 55097942635383719948, 1586719679112182359124]

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

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