Number of base 21 n-digit numbers with adjacent digits differing by one or less.

A126375

Number of base 21 n-digit numbers with adjacent digits differing by one or less.

Terms

    a(0) =1a(1) =21a(2) =61a(3) =179a(4) =527a(5) =1555a(6) =4595a(7) =13593a(8) =40245a(9) =119235a(10) =353459a(11) =1048285a(12) =3110249a(13) =9231305a(14) =27407185a(15) =81392387a(16) =241773327a(17) =718335747a(18) =2134675683a(19) =6344739309a(20) =18861068265a(21) =56076828573a(22) =166747755621a(23) =495896780609

External references