A123145 - cp's OEIS frontend

A123145 a(1) = 1, a(n) = a(n-1) if n == 1 (mod 4), otherwise a(n) = n * a(n-1) for n >= 2.

n	a(n)
1	1
2	2
3	6
4	24
5	24
6	144
7	1008
8	8064
9	8064
10	80640
11	887040
12	10644480
13	10644480
14	149022720
15	2235340800
16	35765452800
17	35765452800
18	643778150400
19	12231784857600
20	244635697152000
21	244635697152000
22	5381985337344000
23	123785662758912000
24	2970855906213888000

[1, 2, 6, 24, 24, 144, 1008, 8064, 8064, 80640, 887040, 10644480, 10644480, 149022720, 2235340800, 35765452800, 35765452800, 643778150400, 12231784857600, 244635697152000, 244635697152000, 5381985337344000, 123785662758912000, 2970855906213888000]

cp's OEIS Frontend

A123145 a(1) = 1, a(n) = a(n-1) if n == 1 (mod 4), otherwise a(n) = n * a(n-1) for n >= 2.

Table of values

List of values