Number of base 18 circular n-digit numbers with adjacent digits differing by 1 or less.

A124711

Number of base 18 circular n-digit numbers with adjacent digits differing by 1 or less.

Terms

    a(0) =1a(1) =18a(2) =52a(3) =120a(4) =320a(5) =848a(6) =2314a(7) =6374a(8) =17752a(9) =49800a(10) =140582a(11) =398834a(12) =1136270a(13) =3248718a(14) =9316828a(15) =26790080a(16) =77212552a(17) =222993608a(18) =645193126a(19) =1869809474a(20) =5426815810a(21) =15771487250a(22) =45891045208a(23) =133679744924a(24) =389803622998

External references