A137273 - OEIS

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A137273 as a simple table

n	a(n)
1	1
2	1
3	2
4	3
5	6
6	13
7	37
8	134
9	659
10	4416
11	41343
12	546577
13	10345970
14	283128770
15	11306821624
16	664047579721
17	57753201767477
18	7483309752358051

[1,1,2,3,6,13,37,134,659,4416,41343,546577, 10345970,283128770,11306821624,664047579721, 57753201767477,7483309752358051]