Number of n-digit squares with no zero digits.

Terms

a(0) =3a(1) =6a(2) =19a(3) =44a(4) =136a(5) =376a(6) =1061a(7) =2985a(8) =8431a(9) =24009a(10) =67983a(11) =193359a(12) =549697a(13) =1563545a(14) =4446173a(15) =12650545a(16) =35999714a(17) =102439796a(18) =291532841a(19) =829634988a(20) =2360947327a(21) =6719171580a(22) =19122499510a(23) =54423038535a(24) =154888366195