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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.

A119578 a(n) = (n + n^2)*binomial(2*n,n)/2.

Table of values

n a(n)
0 0
1 2
2 18
3 120
4 700
5 3780
6 19404
7 96096
8 463320
9 2187900
10 10161580
11 46558512
12 210924168
13 946454600
14 4212243000
15 18614102400
16 81746933040
17 357041751660
18 1551848136300
19 6715600122000
20 28947771052200
21 124337568995640
22 532337037821160
23 2272426880817600
24 9674281104930000

List of values

[0, 2, 18, 120, 700, 3780, 19404, 96096, 463320, 2187900, 10161580, 46558512, 210924168, 946454600, 4212243000, 18614102400, 81746933040, 357041751660, 1551848136300, 6715600122000, 28947771052200, 124337568995640, 532337037821160, 2272426880817600, 9674281104930000]

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

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