A153939 - OEIS

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A153939 as a simple table

n	a(n)
0	1
1	2
2	4
3	15
4	59
5	432
6	3332
7	48304
8	732710
9	20860338
10	622243455
11	34837075520
12	2043323102439
13	224967044124824
14	25947204334949263
15	5617471553259441802
16	1274053481965034919451
17	542391484462533633238628

[1,2,4,15,59,432,3332,48304,732710,20860338, 622243455,34837075520,2043323102439, 224967044124824,25947204334949263, 5617471553259441802,1274053481965034919451, 542391484462533633238628]