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A197976 as a simple table

na(n)
14
242
3813
422519
5811368
635946076
71888624972
8114746269758
97912720985079
10610470884770406
1152094956940751710
124871691779130290166
13495409898474358881327
1454427906182810588386674
156424384909407981686846705

[4,42,813,22519,811368,35946076,1888624972,
 114746269758,7912720985079,610470884770406,
 52094956940751710,4871691779130290166,
 495409898474358881327,54427906182810588386674,
 6424384909407981686846705]