A147218 - OEIS

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A147218 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	17
8	27
9	575
10	1091
11	10073
12	26275
13	436817
14	1241759
15	99221321
16	359430255
17	57329770665
18	261948614931
19	43007975306403
20	238557155162155
21	61726897724737383

[1,1,1,1,1,1,17,27,575,1091,10073,26275,436817, 1241759,99221321,359430255,57329770665, 261948614931,43007975306403,238557155162155, 61726897724737383]