A125380 Number of base 17 circular n-digit numbers with adjacent digits differing by 5 or less.

1, 17, 157, 1217, 10897, 99567, 930325, 8804659, 84089185, 808066595, 7798163337, 75472491155, 731870201089, 7106464302539, 69065385986985, 671627073012627, 6533884441843137, 63581778953757883, 618832556808380185

Offset

0,2

Comments

[Empirical] a(base,n)=a(base-1,n)+F(5) for base>=5.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..18.

Prog

(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>5)+($[(i+1)mod N]`-$[i]`>5))

Crossrefs

Sequence in context: A142087 A176838 A176622 * A126538 A164746 A198859

Adjacent sequences: A125377 A125378 A125379 * A125381 A125382 A125383

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved