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A238293 as a simple table

na(n)
1256
21836
313405
499036
5730412
65365422
739447709
8290457856
92138629508
1015729683540
11115738375440
12851696818464
136268744175264
1446119373785696
15339401856662548
162497274479295728
1718379234719307992
18135224806527545920

[256,1836,13405,99036,730412,5365422,39447709,
 290457856,2138629508,15729683540,115738375440,
 851696818464,6268744175264,46119373785696,
 339401856662548,2497274479295728,
 18379234719307992,135224806527545920]