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.

A187442 A trisection of A001405 (central binomial coefficients): binomial(3*n,floor(3*n/2)), n>=0.

Table of values

n a(n)
0 1
1 3
2 20
3 126
4 924
5 6435
6 48620
7 352716
8 2704156
9 20058300
10 155117520
11 1166803110
12 9075135300
13 68923264410
14 538257874440
15 4116715363800
16 32247603683100
17 247959266474052
18 1946939425648112
19 15033633249770520
20 118264581564861424

List of values

[1, 3, 20, 126, 924, 6435, 48620, 352716, 2704156, 20058300, 155117520, 1166803110, 9075135300, 68923264410, 538257874440, 4116715363800, 32247603683100, 247959266474052, 1946939425648112, 15033633249770520, 118264581564861424]