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A279462 as a simple table

na(n)
12
220
3180
41722
515484
6129914
71079792
88845592
971540206
10572555634
114544198480
1235814522446
13280584310722
142186897305592
1516968580781888
16131145107324352
171010053181919720
187755079215544062
1959376833021426668

[2,20,180,1722,15484,129914,1079792,8845592,
 71540206,572555634,4544198480,35814522446,
 280584310722,2186897305592,16968580781888,
 131145107324352,1010053181919720,7755079215544062,
 59376833021426668]