A000909 - cp's OEIS frontend

A000909 a(n) = (2n)!(2*n+1)! / n!^2.

n	a(n)
0	1
1	12
2	720
3	100800
4	25401600
5	10059033600
6	5753767219200
7	4487938430976000
8	4577697199595520000
9	5914384781877411840000
10	9439358111876349296640000
11	18236839872145106841108480000
12	41944731705933745734549504000000

[1, 12, 720, 100800, 25401600, 10059033600, 5753767219200, 4487938430976000, 4577697199595520000, 5914384781877411840000, 9439358111876349296640000, 18236839872145106841108480000, 41944731705933745734549504000000]

cp's OEIS Frontend

A000909 a(n) = (2n)!(2*n+1)! / n!^2.

Table of values

List of values

cp's OEIS Frontend

A000909 a(n) = (2*n)!*(2*n+1)! / n!^2.

Table of values

List of values

A000909 a(n) = (2n)!(2*n+1)! / n!^2.