A125326 Number of base 16 circular n-digit numbers with adjacent digits differing by 3 or less.

1, 16, 100, 508, 3004, 18036, 110980, 692204, 4364284, 27740164, 177454720, 1141017256, 7367263276, 47731405088, 310118484762, 2019608005218, 13178042856428, 86126612389832, 563648913800290, 3692893237251226

Offset

0,2

Comments

[Empirical] a(base,n)=a(base-1,n)+A025012(n+1) for base>=3.int(n/2)+1

Links

Table of n, a(n) for n=0..19.

Prog

(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>3)+($[(i+1)mod N]`-$[i]`>3))

Crossrefs

Sequence in context: A014796 A052206 A169721 * A126484 A091100 A061432

Adjacent sequences: A125323 A125324 A125325 * A125327 A125328 A125329

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved