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A013499 as a simple table

na(n)
01
11
28
354
4512
56250
693312
71647086
833554432
9774840978
1020000000000
11570623341222
1217832200896512
13605750213184506
1422224013651116032
15875787780761718750
1636893488147419103232
171654480523772673528354

[1,1,8,54,512,6250,93312,1647086,33554432,
 774840978,20000000000,570623341222,17832200896512,
 605750213184506,22224013651116032,
 875787780761718750,36893488147419103232,
 1654480523772673528354]