A125416 Number of base 28 circular n-digit numbers with adjacent digits differing by 6 or less.

1, 28, 322, 3010, 32830, 364658, 4147612, 47830608, 557530518, 6551280562, 77467665302, 920625665702, 10984613101924, 131489273810104, 1578096648395736, 18980188700616500, 228674496511259030

Offset

0,2

Comments

[Empirical] a(base,n)=a(base-1,n)+F(6) for base>=6.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]`-$[(i+1)mod N]`>6)+($[(i+1)mod N]`-$[i]`>6))

Crossrefs

Sequence in context: A196513 A042520 A022688 * A241038 A055753 A159520

Adjacent sequences: A125413 A125414 A125415 * A125417 A125418 A125419

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved