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A099938 as a simple table

na(n)
12
24
318
4100
5578
63364
719602
8114244
9665858
103880900
1122619538
12131836324
13768398402
144478554084
1526102926098
16152139002500
17886731088898
185168247530884
1930122754096402
20175568277047524
211023286908188738
225964153172084900
2334761632124320658

[2,4,18,100,578,3364,19602,114244,665858,3880900,
 22619538,131836324,768398402,4478554084,
 26102926098,152139002500,886731088898,
 5168247530884,30122754096402,175568277047524,
 1023286908188738,5964153172084900,
 34761632124320658]