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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.

A381676 a(n) = Sum_{k=0..n} binomial(n,k) * ( binomial(n,k) - binomial(n,k-1) )^2.

Table of values

n a(n)
0 1
1 1
2 4
3 17
4 86
5 472
6 2752
7 16753
8 105394
9 680366
10 4484360
11 30067160
12 204508240
13 1408057120
14 9796738304
15 68786005361
16 486845236106
17 3470187822754
18 24891491746792
19 179556655434382
20 1301857088258836
21 9482632068303296
22 69361538748381824
23 509303099950899352

List of values

[1, 1, 4, 17, 86, 472, 2752, 16753, 105394, 680366, 4484360, 30067160, 204508240, 1408057120, 9796738304, 68786005361, 486845236106, 3470187822754, 24891491746792, 179556655434382, 1301857088258836, 9482632068303296, 69361538748381824, 509303099950899352]

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

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