A009347 - 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

A009347 as a simple table

n	a(n)
0	0
1	1
2	-1
3	4
4	-14
5	76
6	-472
7	3592
8	-31600
9	317968
10	-3600384
11	45286528
12	-626654976
13	9459412288
14	-154690373632
15	2724254181760
16	-51403730941952
17	1034595588065536
18	-22124602307346432
19	500961002883890176

[0,1,-1,4,-14,76,-472,3592,-31600,317968,-3600384, 45286528,-626654976,9459412288,-154690373632, 2724254181760,-51403730941952,1034595588065536, -22124602307346432,500961002883890176]