a(n) = number of n-digit terms in A023086.

A159827

a(n) = number of n-digit terms in A023086.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =12a(6) =288a(7) =4032a(8) =47904a(9) =398736a(10) =2668464

External references