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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.

A362281 a(n) = n! * Sum_{k=0..floor(n/2)} n^k * binomial(n-k,k)/(n-k)!.

Table of values

n a(n)
0 1
1 1
2 5
3 19
4 241
5 1601
6 32581
7 308995
8 8655809
9 106673761
10 3805452901
11 57704760851
12 2500580809585
13 45018720191329
14 2295683481085541
15 47848514992963651
16 2806491306922172161
17 66464103165835330625
18 4407449313521981148229
19 116893033842508769526931

List of values

[1, 1, 5, 19, 241, 1601, 32581, 308995, 8655809, 106673761, 3805452901, 57704760851, 2500580809585, 45018720191329, 2295683481085541, 47848514992963651, 2806491306922172161, 66464103165835330625, 4407449313521981148229, 116893033842508769526931]

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

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