Number of base 20 circular n-digit numbers with adjacent digits differing by 1 or less.

A124713

Number of base 20 circular n-digit numbers with adjacent digits differing by 1 or less.

Terms

    a(0) =1a(1) =20a(2) =58a(3) =134a(4) =358a(5) =950a(6) =2596a(7) =7160a(8) =19966a(9) =56078a(10) =158488a(11) =450140a(12) =1283848a(13) =3674600a(14) =10549282a(15) =30365294a(16) =87605806a(17) =253263470a(18) =733498744a(19) =2127803180a(20) =6181574548a(21) =17982188708a(22) =52373316262a(23) =152706201170a(24) =445700295760

External references