A264759 - 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

A264759 as a simple table

n	a(n)
1	0
2	0
3	1
4	1
5	2
6	3
7	10
8	27
9	101
10	364
11	1610
12	7202
13	34659
14	170692
15	864590
16	4463287
17	23415443
18	124526110
19	670224294
20	3644907768
21	20011145443
22	110794212315
23	618187581204

[0,0,1,1,2,3,10,27,101,364,1610,7202,34659,170692, 864590,4463287,23415443,124526110,670224294, 3644907768,20011145443,110794212315,618187581204]