A125485 Number of base 28 circular n-digit numbers with adjacent digits differing by 9 or less.

1, 28, 442, 5878, 90262, 1415878, 22695076, 368310712, 6028038286, 99207708814, 1638704629522, 27132638036202, 449943629944228, 7468996856620028, 124065300876811890, 2061684054575682598, 34269888230469320798

Offset

0,2

Comments

[Empirical] a(base,n)=a(base-1,n)+F(9) for base>=9.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]`-$[(i+1)mod N]`>9)+($[(i+1)mod N]`-$[i]`>9))

Crossrefs

Sequence in context: A121803 A022656 A154588 * A054337 A009685 A007833

Adjacent sequences: A125482 A125483 A125484 * A125486 A125487 A125488

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved