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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.

A221953 a(n) = 5^(n-1) * n! * Catalan(n-1).

Table of values

n a(n)
1 1
2 10
3 300
4 15000
5 1050000
6 94500000
7 10395000000
8 1351350000000
9 202702500000000
10 34459425000000000
11 6547290750000000000
12 1374931057500000000000
13 316234143225000000000000
14 79058535806250000000000000
15 21345804667687500000000000000
16 6190283353629375000000000000000
17 1918987839625106250000000000000000

List of values

[1, 10, 300, 15000, 1050000, 94500000, 10395000000, 1351350000000, 202702500000000, 34459425000000000, 6547290750000000000, 1374931057500000000000, 316234143225000000000000, 79058535806250000000000000, 21345804667687500000000000000, 6190283353629375000000000000000, 1918987839625106250000000000000000]

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

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