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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.

A357729 a(n) = Sum_{k=0..floor(n/2)} (-n)^k * Stirling2(n,2*k).

Table of values

n a(n)
0 1
1 0
2 -2
3 -9
4 -12
5 175
6 1938
7 9506
8 -24248
9 -1065663
10 -12021610
11 -56195425
12 677072220
13 19979234080
14 251733387514
15 1135594212255
16 -29317384858352
17 -901607623649489
18 -13233854770928514
19 -68574233644270566
20 2258648937829442660
21 81748108921355457777

List of values

[1, 0, -2, -9, -12, 175, 1938, 9506, -24248, -1065663, -12021610, -56195425, 677072220, 19979234080, 251733387514, 1135594212255, -29317384858352, -901607623649489, -13233854770928514, -68574233644270566, 2258648937829442660, 81748108921355457777]

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

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