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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.

A074728 a(n) = Sum_{k=1..n} k^(n-k)*binomial(n,k-1).

Table of values

n a(n)
1 1
2 3
3 10
4 39
5 176
6 903
7 5174
8 32623
9 223792
10 1655463
11 13110758
12 110510007
13 986490272
14 9287036671
15 91872460702
16 952034494431
17 10305790066208
18 116254839687543
19 1363631057783942
20 16599343732844455
21 209328335818064176
22 2730323984395924623
23 36780442970179975646

List of values

[1, 3, 10, 39, 176, 903, 5174, 32623, 223792, 1655463, 13110758, 110510007, 986490272, 9287036671, 91872460702, 952034494431, 10305790066208, 116254839687543, 1363631057783942, 16599343732844455, 209328335818064176, 2730323984395924623, 36780442970179975646]

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

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