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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.

A371357 a(n) = 2^(n - HammingWeight(n)) * binomial(2*n, n).

Table of values

n a(n)
0 1
1 2
2 12
3 40
4 560
5 2016
6 14784
7 54912
8 1647360
9 6223360
10 47297536
11 180590592
12 2769055744
13 10650214400
14 82158796800
15 317680680960
16 19696202219520
17 76467608616960
18 594748067020800
19 2316387208396800
20 36135640450990080
21 141101072237199360
22 1103153837490831360

List of values

[1, 2, 12, 40, 560, 2016, 14784, 54912, 1647360, 6223360, 47297536, 180590592, 2769055744, 10650214400, 82158796800, 317680680960, 19696202219520, 76467608616960, 594748067020800, 2316387208396800, 36135640450990080, 141101072237199360, 1103153837490831360]

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

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