A125426 Number of base 14 circular n-digit numbers with adjacent digits differing by 7 or less.

1, 14, 154, 1526, 16842, 188734, 2131486, 24133858, 273522154, 3101064746, 35162941494, 398731033990, 4521498318678, 51272848939898, 581424767349076, 6593256520346056, 74766414184759258, 847838591524496746

Offset

0,2

Comments

[Empirical] a(base,n)=a(base-1,n)+F(7) for base>=7.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..17.

Prog

(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>7)+($[(i+1)mod N]`-$[i]`>7))

Crossrefs

Sequence in context: A097227 A229315 A257288 * A004986 A154248 A006865

Adjacent sequences: A125423 A125424 A125425 * A125427 A125428 A125429

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved