A111911 - cp's OEIS frontend

A111911 a(n) = (4n+1)!/( (2n+1)! * ((n+1)!)^2 ).

n	a(n)
0	1
1	5
2	84
3	2145
4	68068
5	2469012
6	98062800
7	4159088505
8	185392049700
9	8592433629780
10	410935420867920
11	20167102448028900
12	1011343194858833424
13	51656474975499371600
14	2680436673901084633920
15	141007991981718802584105
16	7507710828193055843153700

[1, 5, 84, 2145, 68068, 2469012, 98062800, 4159088505, 185392049700, 8592433629780, 410935420867920, 20167102448028900, 1011343194858833424, 51656474975499371600, 2680436673901084633920, 141007991981718802584105, 7507710828193055843153700]

cp's OEIS Frontend

A111911 a(n) = (4n+1)!/( (2n+1)! * ((n+1)!)^2 ).

Table of values

List of values

cp's OEIS Frontend

A111911 a(n) = (4*n+1)!/( (2*n+1)! * ((n+1)!)^2 ).

Table of values

List of values

A111911 a(n) = (4n+1)!/( (2n+1)! * ((n+1)!)^2 ).