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A006847 as a simple table

na(n)
01
11
22
35
414
558
6238
71516
89020
979892
10635984
117127764
1270757968
13949723600
1411260506056
15175400319992
162416123951952
1742776273847184
18671238787733920
1913302324582892048
20234257439470319776
215135062189842955616
22100292619307729965152

[1,1,2,5,14,58,238,1516,9020,79892,635984,7127764,
 70757968,949723600,11260506056,175400319992,
 2416123951952,42776273847184,671238787733920,
 13302324582892048,234257439470319776,
 5135062189842955616,100292619307729965152]