A125484 Number of base 27 circular n-digit numbers with adjacent digits differing by 9 or less.

1, 27, 423, 5607, 85683, 1337727, 21331503, 344238579, 5599424547, 91540779903, 1501346684863, 24673460611915, 406009294231251, 6686397678162879, 110171301582051951, 1815861973753907787, 29935310771775478339

Offset

0,2

Comments

[Empirical] a(base,n)=a(base-1,n)+F(9) for base>=9.int(n/2)+1 and F(d) is the largest coefficient in (1+x+...+x^(2d))^n

Links

Table of n, a(n) for n=0..16.

Prog

(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>9)+($[(i+1)mod N]`-$[i]`>9))

Crossrefs

Sequence in context: A155988 A096950 A307911 * A022751 A004326 A233022

Adjacent sequences: A125481 A125482 A125483 * A125485 A125486 A125487

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved