A367450 - 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

A367450 as a simple table

n	a(n)
0	1
1	0
2	1
3	0
4	1
5	4
6	12
7	55
8	198
9	979
10	4700
11	22288
12	131612
13	754614
14	4833776
15	32539094
16	225628769
17	1675660796
18	12676652631
19	100996809180
20	830086817650
21	7065404491242

[1,0,1,0,1,4,12,55,198,979,4700,22288,131612, 754614,4833776,32539094,225628769,1675660796, 12676652631,100996809180,830086817650, 7065404491242]