A125442 Number of base 30 circular n-digit numbers with adjacent digits differing by 7 or less.

1, 30, 394, 4230, 52922, 674830, 8809642, 116602894, 1559751802, 21029229666, 285256118294, 3887818433694, 53185566799370, 729717040661210, 10035018502900680, 138252138183877000, 1907423508604126538

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: A280478 A020927 A105468 * A260913 A010835 A022722

Adjacent sequences: A125439 A125440 A125441 * A125443 A125444 A125445

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved