A147219 - OEIS

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A147219 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	5
7	17
8	37
9	107
10	651
11	4763
12	31885
13	243507
14	2726593
15	39573223
16	647861719
17	12294997893
18	299566536047
19	9265546813073
20	344823799726629

[1,1,1,1,1,5,17,37,107,651,4763,31885,243507, 2726593,39573223,647861719,12294997893, 299566536047,9265546813073,344823799726629]