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A037623 as a simple table

na(n)
12
218
3165
41487
513383
6120450
71084052
89756468
987808215
10790273937
117112465433
1264012188900
13576109700102
145184987300918
1546664885708265
16419983971374387
173779855742369483

[2,18,165,1487,13383,120450,1084052,9756468,
 87808215,790273937,7112465433,64012188900,
 576109700102,5184987300918,46664885708265,
 419983971374387,3779855742369483]