A000888 - cp's OEIS frontend

A000888 a(n) = (2n)!^2 / ((n+1)!n!^3).

n	a(n)
0	1
1	2
2	12
3	100
4	980
5	10584
6	121968
7	1472328
8	18404100
9	236390440
10	3103161776
11	41469525552
12	562496897872
13	7726605740000
14	107289439704000
15	1503840313184400
16	21252802073091300
17	302539888334593800
18	4334635827016110000
19	62464383654579522000
20	904841214653480504400

[1, 2, 12, 100, 980, 10584, 121968, 1472328, 18404100, 236390440, 3103161776, 41469525552, 562496897872, 7726605740000, 107289439704000, 1503840313184400, 21252802073091300, 302539888334593800, 4334635827016110000, 62464383654579522000, 904841214653480504400]

cp's OEIS Frontend

A000888 a(n) = (2n)!^2 / ((n+1)!n!^3).

Table of values

List of values

cp's OEIS Frontend

A000888 a(n) = (2*n)!^2 / ((n+1)!*n!^3).

Table of values

List of values

A000888 a(n) = (2n)!^2 / ((n+1)!n!^3).