A125325 - OEIS

A125325

Number of base 15 circular n-digit numbers with adjacent digits differing by 3 or less.

1, 15, 93, 471, 2773, 16585, 101649, 631513, 3965717, 25103901, 159916563, 1023792939, 6580680769, 42436151201, 274373773501, 1777776831901, 11538964492821, 75001583213817, 488059829837697, 3178929941530215

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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: A041428 A052226 A108684 * A126483 A226766 A114240

Adjacent sequences: A125322 A125323 A125324 * A125326 A125327 A125328

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 28 2006

STATUS

approved