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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.

A362276 a(n) = n! * Sum_{k=0..floor(n/2)} (-n/2)^k * binomial(n-k,k)/(n-k)!.

Table of values

n a(n)
0 1
1 1
2 -1
3 -8
4 25
5 326
6 -1709
7 -31016
8 228257
9 5311900
10 -50337449
11 -1429574464
12 16573668409
13 555724876552
14 -7619288730325
15 -294582728145824
16 4662562423032961
17 204200579987319824
18 -3664348770051277073
19 -179294278761195862400
20 3597007651803106610201

List of values

[1, 1, -1, -8, 25, 326, -1709, -31016, 228257, 5311900, -50337449, -1429574464, 16573668409, 555724876552, -7619288730325, -294582728145824, 4662562423032961, 204200579987319824, -3664348770051277073, -179294278761195862400, 3597007651803106610201]

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

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