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A250164 as a simple table

na(n)
16
248
3380
42860
519896
6129648
7810964
84962056
930034672
10180893724
111087112084
126527090276
1339173693352
14235070531992
151410496377492
168463170413616
1750779536937024
18304678626418660
191828075665965204
2010968465043204908

[6,48,380,2860,19896,129648,810964,4962056,
 30034672,180893724,1087112084,6527090276,
 39173693352,235070531992,1410496377492,
 8463170413616,50779536937024,304678626418660,
 1828075665965204,10968465043204908]