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A000840 as a simple table

na(n)
10
20
31
41
52
65
712
831
990
10285
11938
123285
1311983
1445390
15177803
16718390
172986407
1812749364
1955802982
20250068732
211145923828
225363795830
2325620207380
24124767647097
25618983876918
263126035142910
2716060182735947
2883883575376862
29445164927249466
302399098651337048

[0,0,1,1,2,5,12,31,90,285,938,3285,11983,45390,
 177803,718390,2986407,12749364,55802982,250068732,
 1145923828,5363795830,25620207380,124767647097,
 618983876918,3126035142910,16060182735947,
 83883575376862,445164927249466,2399098651337048]