A146858 - 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

A146858 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	5
7	17
8	43
9	153
10	711
11	4787
12	36997
13	323223
14	3456487
15	47029493
16	778875019
17	15666901145
18	390119856899
19	11978383979491
20	447614381910255
21	20341843546977767

[1,1,1,1,1,5,17,43,153,711,4787,36997,323223, 3456487,47029493,778875019,15666901145, 390119856899,11978383979491,447614381910255, 20341843546977767]