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A007712 as a simple table

na(n)
21
32
44
514
672
7316
81730
99728
1064330
11444890
123645441
1328758111
14265434293
152522822881
1625717118338

[1,2,4,14,72,316,1730,9728,64330,444890,3645441,
 28758111,265434293,2522822881,25717118338]