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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.

A353287 a(n) = Sum_{k=0..floor(n/2)} k^k * Stirling2(n-k,k).

Table of values

n a(n)
0 1
1 0
2 1
3 1
4 5
5 13
6 56
7 223
8 1056
9 5243
10 28401
11 163578
12 1003332
13 6506149
14 44464510
15 319066188
16 2396942740
17 18800878491
18 153611297283
19 1304600660023
20 11495292868763
21 104907727533628
22 990067627794487
23 9648859125705064
24 96978616443859923

List of values

[1, 0, 1, 1, 5, 13, 56, 223, 1056, 5243, 28401, 163578, 1003332, 6506149, 44464510, 319066188, 2396942740, 18800878491, 153611297283, 1304600660023, 11495292868763, 104907727533628, 990067627794487, 9648859125705064, 96978616443859923]

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

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