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A271005 as a simple table

na(n)
01
18
244
3208
4928
53904
616000
764768
8260608
91045504
104188160
1116764928
1267084288
13268386304
141073643520
154294770688

[1,8,44,208,928,3904,16000,64768,260608,1045504,
 4188160,16764928,67084288,268386304,1073643520,
 4294770688]