A146811 - 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

A146811 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	3
9	7
10	15
11	31
12	65
13	179
14	483
15	1549
16	5893
17	23203
18	108809
19	513209
20	2742185
21	15938025
22	102500855

[1,1,1,1,1,1,1,3,7,15,31,65,179,483,1549,5893, 23203,108809,513209,2742185,15938025,102500855]