A122649 - cp's OEIS frontend

A122649 Difference between the double factorial of the n-th nonnegative odd number and the double factorial of the n-th nonnegative even number.

n	a(n)
1	0
2	1
3	7
4	57
5	561
6	6555
7	89055
8	1381905
9	24137505
10	468934515
11	10033419375
12	234484536825
13	5943863027025
14	162446292283275
15	4761954230608575
16	149048910271886625
17	4961463912662882625
18	175022432901300859875

[0, 1, 7, 57, 561, 6555, 89055, 1381905, 24137505, 468934515, 10033419375, 234484536825, 5943863027025, 162446292283275, 4761954230608575, 149048910271886625, 4961463912662882625, 175022432901300859875]

cp's OEIS Frontend

A122649 Difference between the double factorial of the n-th nonnegative odd number and the double factorial of the n-th nonnegative even number.

Table of values

List of values