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A220903 as a simple table

na(n)
35
416
568
6392
72905
825508
9251188
102703440
1131462590
12393962080
135289624824
1475921813328
151161309733909
1618873565250876
17324948587103540
185910550393881120
19113284096799562930
202282403914428653360
2148231478277117432040
221066811449438992210000

[5,16,68,392,2905,25508,251188,2703440,31462590,
 393962080,5289624824,75921813328,1161309733909,
 18873565250876,324948587103540,5910550393881120,
 113284096799562930,2282403914428653360,
 48231478277117432040,1066811449438992210000]