A174846 - 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

A174846 as a simple table

n	a(n)
0	1
1	2
2	6
3	20
4	66
5	212
6	756
7	3320
8	11346
9	-11068
10	14556
11	7202120
12	18928476
13	-1376971048
14	-3526491144
15	394396083920
16	1016723438706
17	-148493230507228
18	-383613651929844
19	71479338751223720
20	184867683069498036

[1,2,6,20,66,212,756,3320,11346,-11068,14556, 7202120,18928476,-1376971048,-3526491144, 394396083920,1016723438706,-148493230507228, -383613651929844,71479338751223720, 184867683069498036]