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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.

A343896 a(n) = Sum_{k=0..n} (-1)^(n-k) * k! * binomial(n,k) * binomial(2*n+1,k).

Table of values

n a(n)
0 1
1 2
2 11
3 104
4 1405
5 24694
6 534223
7 13719404
8 407730041
9 13760958410
10 519827337331
11 21726980525392
12 995403499490101
13 49600090942276094
14 2670566242480261175
15 154500457959360271124
16 9557826199486960327153
17 629586464929967678553874
18 43994787057844036765113691

List of values

[1, 2, 11, 104, 1405, 24694, 534223, 13719404, 407730041, 13760958410, 519827337331, 21726980525392, 995403499490101, 49600090942276094, 2670566242480261175, 154500457959360271124, 9557826199486960327153, 629586464929967678553874, 43994787057844036765113691]

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

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