A030876 - OEIS

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A030876 as a simple table

n	a(n)
1	1
2	2
3	6
4	26
5	133
6	799
7	5599
8	44795
9	403160
10	4031607
11	44347682
12	532172186
13	6918238422
14	96855337921
15	1452830068828
16	23245281101260
17	395169778721427
18	7113056016985690
19	135148064322728118
20	2702961286454562374

[1,2,6,26,133,799,5599,44795,403160,4031607, 44347682,532172186,6918238422,96855337921, 1452830068828,23245281101260,395169778721427, 7113056016985690,135148064322728118, 2702961286454562374]