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A090015 as a simple table

na(n)
16
236
3258
42136
519998
6208524
72393754
829976192
9406446774
105930064372
1192608986546
121541044428456
1327216454135758
14508388707585116
1510013199347882058
16207381428863832784
174505207996358719334

[6,36,258,2136,19998,208524,2393754,29976192,
 406446774,5930064372,92608986546,1541044428456,
 27216454135758,508388707585116,10013199347882058,
 207381428863832784,4505207996358719334]