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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.

A052704 Apart from the leading term, a(n) = Catalan(n-1)*4^(n-1).

Table of values

n a(n)
0 0
1 1
2 4
3 32
4 320
5 3584
6 43008
7 540672
8 7028736
9 93716480
10 1274544128
11 17611882496
12 246566354944
13 3489862254592
14 49855175065600
15 717914520944640
16 10409760553697280
17 151860036312760320
18 2227280532587151360
19 32823081532863283200
20 485781606686376591360
21 7217326727911880785920

List of values

[0, 1, 4, 32, 320, 3584, 43008, 540672, 7028736, 93716480, 1274544128, 17611882496, 246566354944, 3489862254592, 49855175065600, 717914520944640, 10409760553697280, 151860036312760320, 2227280532587151360, 32823081532863283200, 485781606686376591360, 7217326727911880785920]

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

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