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A220920 as a simple table

na(n)
14
244
3324
42456
518606
6141464
71073265
88150889
961863941
10469706074
113565661822
1227070430317
13205508452073
141560178900248
1511844428071293
1689919992489163
17682648660439116
185182493876535532
1939344142007624031

[4,44,324,2456,18606,141464,1073265,8150889,
 61863941,469706074,3565661822,27070430317,
 205508452073,1560178900248,11844428071293,
 89919992489163,682648660439116,5182493876535532,
 39344142007624031]