A066211 - cp's OEIS frontend

A066211 a(n) = Sum_{j=0..n} (2n)!/(2n-j)!.

n	a(n)
0	1
1	3
2	17
3	157
4	2081
5	36101
6	773665
7	19726085
8	582913217
9	19582414021
10	736891600001
11	30699450566885
12	1402556105125345
13	69719685409234277
14	3745929254826233441
15	216310377722912693701
16	13359435408855851031425
17	878701820865582786218885

[1, 3, 17, 157, 2081, 36101, 773665, 19726085, 582913217, 19582414021, 736891600001, 30699450566885, 1402556105125345, 69719685409234277, 3745929254826233441, 216310377722912693701, 13359435408855851031425, 878701820865582786218885]

cp's OEIS Frontend

A066211 a(n) = Sum_{j=0..n} (2n)!/(2n-j)!.

Table of values

List of values

cp's OEIS Frontend

A066211 a(n) = Sum_{j=0..n} (2*n)!/(2*n-j)!.

Table of values

List of values

A066211 a(n) = Sum_{j=0..n} (2n)!/(2n-j)!.