A222559 - cp's OEIS frontend

A222559 a(0) = 0. If n is odd, a(n) = a(n-1) * n, otherwise a(n) = a(n-1) + n.

n	a(n)
0	0
1	0
2	2
3	6
4	10
5	50
6	56
7	392
8	400
9	3600
10	3610
11	39710
12	39722
13	516386
14	516400
15	7746000
16	7746016
17	131682272
18	131682290
19	2501963510
20	2501963530
21	52541234130
22	52541234152
23	1208448385496
24	1208448385520
25	30211209638000
26	30211209638026
27	815702660226702
28	815702660226730

[0, 0, 2, 6, 10, 50, 56, 392, 400, 3600, 3610, 39710, 39722, 516386, 516400, 7746000, 7746016, 131682272, 131682290, 2501963510, 2501963530, 52541234130, 52541234152, 1208448385496, 1208448385520, 30211209638000, 30211209638026, 815702660226702, 815702660226730]

cp's OEIS Frontend

A222559 a(0) = 0. If n is odd, a(n) = a(n-1) * n, otherwise a(n) = a(n-1) + n.

Table of values

List of values