A154259 - OEIS

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A154259 as a simple table

n	a(n)
1	1
2	2
3	7
4	30
5	155
6	950
7	6706
8	52996
9	459256
10	4303020
11	43163392
12	460170882
13	5184956805
14	61468942912
15	763967696243
16	9924157671028
17	134400823231643
18	1893397004671954
19	27693154054839058
20	419804185629085664

[1,2,7,30,155,950,6706,52996,459256,4303020, 43163392,460170882,5184956805,61468942912, 763967696243,9924157671028,134400823231643, 1893397004671954,27693154054839058, 419804185629085664]