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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.

A357831 a(n) = Sum_{k=0..floor(n/3)} 2^k * |Stirling1(n,3*k)|.

Table of values

n a(n)
0 1
1 0
2 0
3 2
4 12
5 70
6 454
7 3332
8 27552
9 254400
10 2598852
11 29125932
12 355455468
13 4693396656
14 66671326176
15 1013916648840
16 16436063079552
17 282920894841096
18 5153797995148296
19 99052313167391760
20 2003040751641857856
21 42513854724369719136
22 944959706480298199824

List of values

[1, 0, 0, 2, 12, 70, 454, 3332, 27552, 254400, 2598852, 29125932, 355455468, 4693396656, 66671326176, 1013916648840, 16436063079552, 282920894841096, 5153797995148296, 99052313167391760, 2003040751641857856, 42513854724369719136, 944959706480298199824]

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

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