A012267 - 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

A012267 as a simple table

n	a(n)
0	0
1	0
2	2
3	-6
4	22
5	-100
6	668
7	-6048
8	64776
9	-763488
10	9918072
11	-144472680
12	2365739880
13	-42879666960
14	845124232080
15	-17930092309920
16	408038138491200
17	-9939819541747200
18	258294825756089760
19	-7127596576224545760

[0,0,2,-6,22,-100,668,-6048,64776,-763488,9918072, -144472680,2365739880,-42879666960,845124232080, -17930092309920,408038138491200,-9939819541747200, 258294825756089760,-7127596576224545760]