A147234 - OEIS

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A147234 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	3
6	7
7	19
8	49
9	195
10	1111
11	7177
12	51609
13	452845
14	5123643
15	72369101
16	1214915609
17	24818665423
18	626087799933
19	19508645488885
20	741333829643879

[1,1,1,1,3,7,19,49,195,1111,7177,51609,452845, 5123643,72369101,1214915609,24818665423, 626087799933,19508645488885,741333829643879]