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A125431 Number of base 19 circular n-digit numbers with adjacent digits differing by 7 or less. 0
1, 19, 229, 2371, 28117, 340639, 4206175, 52452531, 657946661, 8280460237, 104408596879, 1317891532471, 16644977894179, 210297040134369, 2657451892030143, 33584889901686421, 424471412263606133 (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: A041688 A140843 A243420 * A104116 A028026 A135487

Adjacent sequences:  A125428 A125429 A125430 * A125432 A125433 A125434

KEYWORD

nonn,base

AUTHOR

R. H. Hardin, Dec 28 2006

STATUS

approved

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Last modified July 12 06:48 EDT 2020. Contains 335657 sequences. (Running on oeis4.)