A000168 - cp's OEIS frontend

A000168 a(n) = 23^n(2n)!/(n!(n+2)!).

n	a(n)
0	1
1	2
2	9
3	54
4	378
5	2916
6	24057
7	208494
8	1876446
9	17399772
10	165297834
11	1602117468
12	15792300756
13	157923007560
14	1598970451545
15	16365932856990
16	169114639522230
17	1762352559231660
18	18504701871932430
19	195621134074714260
20	2080697516976506220
21	22254416920705240440
22	239234981897581334730
23	2583737804493878415084

[1, 2, 9, 54, 378, 2916, 24057, 208494, 1876446, 17399772, 165297834, 1602117468, 15792300756, 157923007560, 1598970451545, 16365932856990, 169114639522230, 1762352559231660, 18504701871932430, 195621134074714260, 2080697516976506220, 22254416920705240440, 239234981897581334730, 2583737804493878415084]

cp's OEIS Frontend

A000168 a(n) = 23^n(2n)!/(n!(n+2)!).

Table of values

List of values

cp's OEIS Frontend

A000168 a(n) = 2*3^n*(2*n)!/(n!*(n+2)!).

Table of values

List of values

A000168 a(n) = 23^n(2n)!/(n!(n+2)!).