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A081568 as a simple table

na(n)
01
14
217
375
4338
51541
67069
732532
8149965
9691903
103193706
1114745009
1268084297
13314394980
141451837593
156704518371
1630961415074
17142980203437
18660285858245
193049218769908
2014081386948661
2165028302171639
22300302858766202
231386808687475385
246404329365899473

[1,4,17,75,338,1541,7069,32532,149965,691903,
 3193706,14745009,68084297,314394980,1451837593,
 6704518371,30961415074,142980203437,660285858245,
 3049218769908,14081386948661,65028302171639,
 300302858766202,1386808687475385,6404329365899473]