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A271813 as a simple table

na(n)
01
18
244
3212
4916
53736
615372
761728
8247980
9993524
103978640
1115927748
1263725264
13254965564
141019900556
154079770028

[1,8,44,212,916,3736,15372,61728,247980,993524,
 3978640,15927748,63725264,254965564,1019900556,
 4079770028]