A125337 Number of base 27 circular n-digit numbers with adjacent digits differing by 3 or less.

1, 27, 177, 915, 5545, 33997, 213621, 1359805, 8748521, 56739057, 370374447, 2430484743, 16019733493, 105982096949, 703383900487, 4681112144755, 31228495404521, 208772665807697, 1398339225679299, 9381662291084581

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: A269054 A248234 A083560 * A126495 A224454 A258637

Adjacent sequences: A125334 A125335 A125336 * A125338 A125339 A125340

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved