A012960 - OEIS

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A012960 as a simple table

n	a(n)
0	1
1	2
2	3
3	2
4	-11
5	-30
6	175
7	1010
8	-6135
9	-60670
10	374875
11	5719650
12	-35199875
13	-779710750
14	4687746375
15	145208599250
16	-836951243375
17	-35435177514750
18	191995883837875
19	10975003189933250
20	-54688433347786875

[1,2,3,2,-11,-30,175,1010,-6135,-60670,374875, 5719650,-35199875,-779710750,4687746375, 145208599250,-836951243375,-35435177514750, 191995883837875,10975003189933250, -54688433347786875]