cp's OEIS Frontend

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.

A005017 Denominator of (binomial(2*n-2,n-1)/n!)^2.

Table of values

n a(n)
1 1
2 1
3 1
4 36
5 144
6 400
7 3600
8 2822400
9 16257024
10 32920473600
11 823011840000
12 8129341440000
13 292656291840000
14 3877578804363264
15 58642395498086400
16 844450495172444160000
17 54044831691036426240000
18 1161740555606493757440000
19 76817130615613056614400

List of values

[1, 1, 1, 36, 144, 400, 3600, 2822400, 16257024, 32920473600, 823011840000, 8129341440000, 292656291840000, 3877578804363264, 58642395498086400, 844450495172444160000, 54044831691036426240000, 1161740555606493757440000, 76817130615613056614400]

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

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