A146784 - 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

A146784 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	19
8	31
9	615
10	1219
11	16139
12	42305
13	1128827
14	3502811
15	254593369
16	985218883
17	138612115423
18	664622922147
19	144116871368241
20	849726636226171
21	336332191825755637

[1,1,1,1,1,1,19,31,615,1219,16139,42305,1128827, 3502811,254593369,985218883,138612115423, 664622922147,144116871368241,849726636226171, 336332191825755637]