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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.

A362350 a(n) = n! * Sum_{k=0..floor(n/2)} (k/2)^k / (k! * (n-2*k)!).

Table of values

n a(n)
0 1
1 1
2 2
3 4
4 19
5 71
6 601
7 3277
8 39089
9 277489
10 4250341
11 37110701
12 693581197
13 7184750509
14 158461520309
15 1899055549861
16 48269252293201
17 656869268651537
18 18903165795857089
19 287927838327392929
20 9252988524143245181
21 155954097639111859501

List of values

[1, 1, 2, 4, 19, 71, 601, 3277, 39089, 277489, 4250341, 37110701, 693581197, 7184750509, 158461520309, 1899055549861, 48269252293201, 656869268651537, 18903165795857089, 287927838327392929, 9252988524143245181, 155954097639111859501]

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

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