Number of base 20 n-digit numbers with adjacent digits differing by one or less.

A126374

Number of base 20 n-digit numbers with adjacent digits differing by one or less.

Terms

    a(0) =1a(1) =20a(2) =58a(3) =170a(4) =500a(5) =1474a(6) =4352a(7) =12864a(8) =38058a(9) =112674a(10) =333776a(11) =989236a(12) =2933102a(13) =8699864a(14) =25812862a(15) =76609418a(16) =227424420a(17) =675289026a(18) =2005535520a(19) =5957318820a(20) =17698806798a(21) =52590044172a(22) =156287402420a(23) =464515721050

External references