A123022 - cp's OEIS frontend

A123022 a(n) = n!b(n) where b(n) = (n-4)b(n-2)/(n*(n-1)) and b(0) = b(1) = 1.

n	a(n)
0	1
1	1
2	-2
3	-1
4	0
5	-1
6	0
7	-3
8	0
9	-15
10	0
11	-105
12	0
13	-945
14	0
15	-10395
16	0
17	-135135
18	0
19	-2027025
20	0
21	-34459425
22	0
23	-654729075
24	0
25	-13749310575
26	0
27	-316234143225
28	0
29	-7905853580625
30	0
31	-213458046676875
32	0
33	-6190283353629375
34	0
35	-191898783962510625
36	0
37	-6332659870762850625
38	0

[1, 1, -2, -1, 0, -1, 0, -3, 0, -15, 0, -105, 0, -945, 0, -10395, 0, -135135, 0, -2027025, 0, -34459425, 0, -654729075, 0, -13749310575, 0, -316234143225, 0, -7905853580625, 0, -213458046676875, 0, -6190283353629375, 0, -191898783962510625, 0, -6332659870762850625, 0]

cp's OEIS Frontend

A123022 a(n) = n!b(n) where b(n) = (n-4)b(n-2)/(n*(n-1)) and b(0) = b(1) = 1.

Table of values

List of values

cp's OEIS Frontend

A123022 a(n) = n!*b(n) where b(n) = (n-4)*b(n-2)/(n*(n-1)) and b(0) = b(1) = 1.

Table of values

List of values

A123022 a(n) = n!b(n) where b(n) = (n-4)b(n-2)/(n*(n-1)) and b(0) = b(1) = 1.