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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.

A181071 a(n) = Sum_{k=0..floor(n/2)} binomial(n-k,k)^(k+1) * n/(n-k).

Table of values

n a(n)
1 1
2 3
3 7
4 15
5 66
6 357
7 1891
8 20559
9 257605
10 3436908
11 96199478
12 2734569969
13 96260508267
14 6820892444439
15 438665726703387
16 43006289605790127
17 7366025744010911808
18 1099005822684238964181
19 309398207716948885643749

List of values

[1, 3, 7, 15, 66, 357, 1891, 20559, 257605, 3436908, 96199478, 2734569969, 96260508267, 6820892444439, 438665726703387, 43006289605790127, 7366025744010911808, 1099005822684238964181, 309398207716948885643749]

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

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