A145942 - OEIS

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A145942 as a simple table

n	a(n)
1	1
2	1
3	3
4	13
5	59
6	335
7	2897
8	37715
9	690357
10	17737939
11	624778919
12	31083795113
13	2181813132547
14	218875670124419
15	30699194550031869
16	6100362669555259551
17	1691513945329277743047
18	667365921802550365450107

[1,1,3,13,59,335,2897,37715,690357,17737939, 624778919,31083795113,2181813132547, 218875670124419,30699194550031869, 6100362669555259551,1691513945329277743047, 667365921802550365450107]

[1,1,3,13,59,335,2897,37715,690357,17737939,
 624778919,31083795113,2181813132547,
 218875670124419,30699194550031869,
 6100362669555259551,1691513945329277743047,
 667365921802550365450107]