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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.

A195686 a(n) = C(2*n,n) / gcd(n,C(2*n,n)).

Table of values

n a(n)
0 1
1 2
2 3
3 20
4 35
5 252
6 154
7 3432
8 6435
9 48620
10 92378
11 705432
12 676039
13 10400600
14 20058300
15 10341168
16 300540195
17 2333606220
18 1512522550
19 35345263800
20 6892326441
21 179419291480
22 1052049481860
23 8233430727600
24 2687300306925
25 126410606437752
26 247959266474052

List of values

[1, 2, 3, 20, 35, 252, 154, 3432, 6435, 48620, 92378, 705432, 676039, 10400600, 20058300, 10341168, 300540195, 2333606220, 1512522550, 35345263800, 6892326441, 179419291480, 1052049481860, 8233430727600, 2687300306925, 126410606437752, 247959266474052]

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

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