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A125430 Number of base 18 circular n-digit numbers with adjacent digits differing by 7 or less. 0
1, 18, 214, 2202, 25862, 310258, 3787948, 46645456, 577150510, 7159272162, 88927443434, 1105386497794, 13745406254372, 170957599435056, 2126500579257954, 26452521788330842, 329064936891773982 (list; graph; refs; listen; history; text; internal format)
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: A021804 A025932 A260569 * A021764 A059357 A324638

Adjacent sequences:  A125427 A125428 A125429 * A125431 A125432 A125433

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 28 2006

STATUS

approved

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Last modified February 26 03:09 EST 2020. Contains 332272 sequences. (Running on oeis4.)