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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.

A357552 a(n) = sigma(n) * binomial(2*n-1,n), for n >= 1.

Table of values

n a(n)
1 1
2 9
3 40
4 245
5 756
6 5544
7 13728
8 96525
9 316030
10 1662804
11 4232592
12 37858184
13 72804200
14 481399200
15 1861410240
16 9316746045
17 21002455980
18 176965138350
19 353452638000
20 2894777105220
21 8612125991040
22 37873781346960
23 98801168731200
24 967428110493000
25 1959364399785156

List of values

[1, 9, 40, 245, 756, 5544, 13728, 96525, 316030, 1662804, 4232592, 37858184, 72804200, 481399200, 1861410240, 9316746045, 21002455980, 176965138350, 353452638000, 2894777105220, 8612125991040, 37873781346960, 98801168731200, 967428110493000, 1959364399785156]

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

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