A154232 - cp's OEIS frontend

A154232 a(2n) = (n^2-n-1) + a(2n-2), a(2n+1) = (n^2-n-1)*a(2n-1), with a(0)=0 and a(1)=1.

n	a(n)
0	0
1	1
2	-1
3	-1
4	0
5	-1
6	5
7	-5
8	16
9	-55
10	35
11	-1045
12	64
13	-30305
14	105
15	-1242505
16	160
17	-68337775
18	231
19	-4851982025
20	320
21	-431826400225
22	429
23	-47069077624525
24	560
25	-6166049168812775
26	715
27	-955737621165980125
28	896
29	-172988509431042402625

[0, 1, -1, -1, 0, -1, 5, -5, 16, -55, 35, -1045, 64, -30305, 105, -1242505, 160, -68337775, 231, -4851982025, 320, -431826400225, 429, -47069077624525, 560, -6166049168812775, 715, -955737621165980125, 896, -172988509431042402625]

cp's OEIS Frontend

A154232 a(2n) = (n^2-n-1) + a(2n-2), a(2n+1) = (n^2-n-1)*a(2n-1), with a(0)=0 and a(1)=1.

Table of values

List of values