A147243 - 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

A147243 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	3
8	5
9	11
10	21
11	39
12	109
13	383
14	1291
15	5187
16	19147
17	85163
18	418695
19	2523925
20	15886439
21	116954773
22	866328129

[1,1,1,1,1,1,3,5,11,21,39,109,383,1291,5187,19147, 85163,418695,2523925,15886439,116954773,866328129]