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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.

A003645 a(n) = 2^n * C(n+1), where C(n) = A000108(n) Catalan numbers.

Table of values

n a(n)
0 1
1 4
2 20
3 112
4 672
5 4224
6 27456
7 183040
8 1244672
9 8599552
10 60196864
11 426008576
12 3042918400
13 21909012480
14 158840340480
15 1158600130560
16 8496400957440
17 62605059686400
18 463277441679360
19 3441489566760960
20 25654740406763520
21 191852841302753280
22 1438896309770649600

List of values

[1, 4, 20, 112, 672, 4224, 27456, 183040, 1244672, 8599552, 60196864, 426008576, 3042918400, 21909012480, 158840340480, 1158600130560, 8496400957440, 62605059686400, 463277441679360, 3441489566760960, 25654740406763520, 191852841302753280, 1438896309770649600]

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

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