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A038748 as a simple table

na(n)
10
20
31
47
536
6168
7736
83151
913190
1054938
11226597
12934200
133831219
1415723801
1564313623
16263316219
171075420890
184396310382
1917937457304
2073247306563
21298635873550
221218428664338

[0,0,1,7,36,168,736,3151,13190,54938,226597,
 934200,3831219,15723801,64313623,263316219,
 1075420890,4396310382,17937457304,73247306563,
 298635873550,1218428664338]