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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.

A099169 a(n) = (1/n) * Sum_{k=0..n-1} C(n,k) * C(n,k+1) * (n-1)^k.

Table of values

n a(n)
1 1
2 2
3 11
4 100
5 1257
6 20076
7 387739
8 8766248
9 226739489
10 6595646860
11 212944033051
12 7550600079672
13 291527929539433
14 12169325847587832
15 545918747361417291
16 26183626498897556176
17 1336713063706757646465

List of values

[1, 2, 11, 100, 1257, 20076, 387739, 8766248, 226739489, 6595646860, 212944033051, 7550600079672, 291527929539433, 12169325847587832, 545918747361417291, 26183626498897556176, 1336713063706757646465]

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

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