A146856 - OEIS

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A146856 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	17
8	27
9	587
10	1133
11	10901
12	28287
13	585741
14	1701229
15	131274347
16	487724577
17	70353958073
18	323657950757
19	55264471537249
20	310091943069627
21	90510403672783457
22	614791345688856355

[1,1,1,1,1,1,17,27,587,1133,10901,28287,585741, 1701229,131274347,487724577,70353958073, 323657950757,55264471537249,310091943069627, 90510403672783457,614791345688856355]