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A125381 Number of base 18 circular n-digit numbers with adjacent digits differing by 5 or less. 0
1, 18, 168, 1308, 11788, 108368, 1019238, 9713414, 93465716, 905458656, 8814132218, 86094716902, 842995538722, 8268296567458, 81194927188214, 798010003387898, 7847743232008148, 77207807539770572, 759807537336050712 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

[Empirical] a(base,n)=a(base-1,n)+F(5) for base>=5.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..18.

PROG

(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>5)+($[(i+1)mod N]`-$[i]`>5))

CROSSREFS

Sequence in context: A208827 A327792 A071539 * A126539 A213802 A161499

Adjacent sequences: A125378 A125379 A125380 * A125382 A125383 A125384

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 28 2006

STATUS

approved

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Last modified February 3 13:54 EST 2023. Contains 360035 sequences. (Running on oeis4.)