Number of n-digit terms in A048398.

Terms

a(0) =4a(1) =4a(2) =2a(3) =1a(4) =12a(5) =20a(6) =35a(7) =28a(8) =80a(9) =114a(10) =211a(11) =228a(12) =736a(13) =1214a(14) =2101a(15) =2536a(16) =7799a(17) =13830a(18) =22107a(19) =27265a(20) =82611a(21) =144324a(22) =259260a(23) =354029a(24) =901774a(25) =1651718a(26) =2913981a(27) =3913728a(28) =11048656a(29) =19782855