A146875 - 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

A146875 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	5
10	13
11	25
12	41
13	109
14	333
15	897
16	2841
17	13365
18	66133
19	320121
20	1501457
21	8213389
22	51555309

[1,1,1,1,1,1,1,1,5,13,25,41,109,333,897,2841, 13365,66133,320121,1501457,8213389,51555309]