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A239531 as a simple table

na(n)
12
22
324
468
5406
61584
77790
833630
9156032
10695344
113168922
1214262616
1364640674
14291830210
151320357280
165966652996
1726981170086
18121963213688
19551425857374
202492844327694
2111270188295640
2250950869428672
23230346017497690

[2,2,24,68,406,1584,7790,33630,156032,695344,
 3168922,14262616,64640674,291830210,1320357280,
 5966652996,26981170086,121963213688,551425857374,
 2492844327694,11270188295640,50950869428672,
 230346017497690]