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A018207 as a simple table

na(n)
01
125
2439
36685
494471
51276405
616745119
7215226205
82725568791
934135388485
10423910350799
115229781276525
1264185946519111
13784517071831765
149557062002788479
15116113315455883645
161407645499737869431

[1,25,439,6685,94471,1276405,16745119,215226205,
 2725568791,34135388485,423910350799,5229781276525,
 64185946519111,784517071831765,9557062002788479,
 116113315455883645,1407645499737869431]