A125428 Number of base 16 circular n-digit numbers with adjacent digits differing by 7 or less.

1, 16, 184, 1864, 21352, 249496, 2954044, 35167876, 419756872, 5015971864, 59971194884, 717190706556, 8577760468228, 102596987977708, 1227170820007330, 14678437539684814, 175572556087135224

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: A230992 A016298 A288720 * A203391 A016249 A021049

Adjacent sequences: A125425 A125426 A125427 * A125429 A125430 A125431

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved