Number of primes with n distinct decimal digits, none of which are 0.

Terms

a(0) =4a(1) =20a(2) =83a(3) =395a(4) =1610a(5) =5045a(6) =12850a(7) =23082a(8) =0a(9) =0a(10) =0a(11) =0a(12) =0a(13) =0a(14) =0a(15) =0a(16) =0a(17) =0a(18) =0a(19) =0a(20) =0a(21) =0a(22) =0a(23) =0a(24) =0a(25) =0a(26) =0a(27) =0a(28) =0a(29) =0