A009566 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A009566 as a simple table

n	a(n)
0	0
1	1
2	-2
3	8
4	-47
5	359
6	-3349
7	36756
8	-462972
9	6574704
10	-103861896
11	1805930928
12	-34267701720
13	704555489832
14	-15601914340440
15	370195510608192
16	-9369769657984128
17	251979258929744448
18	-7175127496412091456

[0,1,-2,8,-47,359,-3349,36756,-462972,6574704, -103861896,1805930928,-34267701720,704555489832, -15601914340440,370195510608192,-9369769657984128, 251979258929744448,-7175127496412091456]