Number of base-3 n-digit pandigital numbers.

Terms

a(0) =0a(1) =0a(2) =4a(3) =24a(4) =100a(5) =360a(6) =1204a(7) =3864a(8) =12100a(9) =37320a(10) =114004a(11) =346104a(12) =1046500a(13) =3155880a(14) =9500404a(15) =28566744a(16) =85831300a(17) =257756040a(18) =773792404a(19) =2322425784a(20) =6969374500a(21) =20912317800a(22) =62745342004a(23) =188252803224a(24) =564791964100