A156436 - 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

A156436 as a simple table

n	a(n)
1	1
2	0
3	0
4	3
5	5
6	12
7	54
8	426
9	2334
10	23280
11	152820
12	1939740
13	14564760
14	222925920
15	1890254100
16	33899743010
17	320743643010
18	6597891367200
19	68944295861280
20	1600434039456630
21	18309730315533930
22	473501454337711800

[1,0,0,3,5,12,54,426,2334,23280,152820,1939740, 14564760,222925920,1890254100,33899743010, 320743643010,6597891367200,68944295861280, 1600434039456630,18309730315533930, 473501454337711800]