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.

A361028 a(n) = 2*(3*n)!/(n!*(n+1)!^2).

Table of values

n a(n)
0 2
1 3
2 20
3 210
4 2772
5 42042
6 700128
7 12471030
8 233716340
9 4557468630
10 91752013080
11 1896208270320
12 40055997189600
13 862021408906800
14 18849534808095360
15 417929529573239310
16 9379553386892837940
17 212776905535994934750
18 4873239487455972633000
19 112571832160232967822300

List of values

[2, 3, 20, 210, 2772, 42042, 700128, 12471030, 233716340, 4557468630, 91752013080, 1896208270320, 40055997189600, 862021408906800, 18849534808095360, 417929529573239310, 9379553386892837940, 212776905535994934750, 4873239487455972633000, 112571832160232967822300]