A125427 - OEIS

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A125427

Number of base 15 circular n-digit numbers with adjacent digits differing by 7 or less.

1, 15, 169, 1695, 19097, 219115, 2540413, 29568547, 344726553, 4021721265, 46932054649, 547742536301, 6392983509989, 74617206197211, 870919028712223, 10165247714847775, 118647535970217257, 1384840366115001717

(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..17.

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: A201087 A138973 A016177 * A016279 A036734 A201041

Adjacent sequences: A125424 A125425 A125426 * A125428 A125429 A125430

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 28 2006

STATUS

approved