A000515 - cp's OEIS frontend

A000515 a(n) = (2n)!(2n+1)!/n!^4, or equally (2n+1)*binomial(2n,n)^2.

n	a(n)
0	1
1	12
2	180
3	2800
4	44100
5	698544
6	11099088
7	176679360
8	2815827300
9	44914183600
10	716830370256
11	11445589052352
12	182811491808400
13	2920656969720000
14	46670906271240000
15	745904795339462400
16	11922821963004219300
17	190600129650794094000
18	3047248986392325330000

[1, 12, 180, 2800, 44100, 698544, 11099088, 176679360, 2815827300, 44914183600, 716830370256, 11445589052352, 182811491808400, 2920656969720000, 46670906271240000, 745904795339462400, 11922821963004219300, 190600129650794094000, 3047248986392325330000]

cp's OEIS Frontend

A000515 a(n) = (2n)!(2n+1)!/n!^4, or equally (2n+1)*binomial(2n,n)^2.

Table of values

List of values