A041239 - OEIS

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A041239 as a simple table

n	a(n)
0	1
1	2
2	9
3	101
4	413
5	927
6	20807
7	42541
8	190971
9	2143222
10	8763859
11	19670940
12	441524539
13	902720018
14	4052404611
15	45479170739
16	185969087567
17	417417345873
18	9369150696773
19	19155718739419
20	85992025654449

[1,2,9,101,413,927,20807,42541,190971,2143222, 8763859,19670940,441524539,902720018,4052404611, 45479170739,185969087567,417417345873, 9369150696773,19155718739419,85992025654449]