A009217 - 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

A009217 as a simple table

n	a(n)
0	1
1	2
2	4
3	-88
4	-1136
5	46112
6	1098304
7	-103251328
8	-1963486976
9	585781985792
10	-5685626878976
11	-6083058037577728
12	447306486332821504
13	87514624808197824512
14	-19369074730552627675136

[1,2,4,-88,-1136,46112,1098304,-103251328, -1963486976,585781985792,-5685626878976, -6083058037577728,447306486332821504, 87514624808197824512,-19369074730552627675136]