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A125456 Number of base 21 circular n-digit numbers with adjacent digits differing by 8 or less. 0
1, 21, 285, 3333, 44589, 609441, 8484027, 119207781, 1683956109, 23857954869, 338563579455, 4808766812871, 68334330572247, 971314874179749, 13808436456553037, 196319581589707923, 2791268881281069805 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

[Empirical] a(base,n)=a(base-1,n)+F(8) for base>=8.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]`-$[(i+1)mod N]`>8)+($[(i+1)mod N]`-$[i]`>8))

CROSSREFS

Sequence in context: A028033 A176711 A025987 * A296333 A028028 A296633

Adjacent sequences:  A125453 A125454 A125455 * A125457 A125458 A125459

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 28 2006

STATUS

approved

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Last modified May 27 12:58 EDT 2022. Contains 354097 sequences. (Running on oeis4.)