A125438 Number of base 26 circular n-digit numbers with adjacent digits differing by 7 or less.

1, 26, 334, 3554, 43902, 553306, 7135630, 93271834, 1231458766, 16376454818, 218938689224, 2938429752768, 39550154759946, 533443662253450, 7205953681467518, 97448916863238514, 1318905084028233358

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..16.

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: A022621 A085743 A205494 * A126919 A035708 A252826

Adjacent sequences: A125435 A125436 A125437 * A125439 A125440 A125441

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved