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A081893 as a simple table

na(n)
01
16
233
3172
4864
54224
620224
795232
8442368
92031616
109240576
1141680896
12186646528
13830472192
143674210304
1516173236224
1670866960384
17309237645312
181344324763648
195823975653376
2025151328485376
21108301895335936

[1,6,33,172,864,4224,20224,95232,442368,2031616,
 9240576,41680896,186646528,830472192,3674210304,
 16173236224,70866960384,309237645312,
 1344324763648,5823975653376,25151328485376,
 108301895335936]