A125389 Number of base 26 circular n-digit numbers with adjacent digits differing by 5 or less.

1, 26, 256, 2036, 18916, 178776, 1730542, 16983454, 168485308, 1685157860, 16963782666, 171654215594, 1744297209730, 17786783187134, 181898203342216, 1864685423926896, 19153948120401164, 197081201888778900

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..17.

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: A086023 A296539 A229715 * A109467 A126547 A136922

Adjacent sequences: A125386 A125387 A125388 * A125390 A125391 A125392

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved