A125419 Number of base 31 circular n-digit numbers with adjacent digits differing by 6 or less.

1, 31, 361, 3391, 37237, 416111, 4761901, 55250583, 648017421, 7662743017, 91199048321, 1091067528549, 13108510159921, 158042063686499, 1910968040115173, 23162642662833881, 281323809804798781

Offset

0,2

Comments

[Empirical] a(base,n)=a(base-1,n)+F(6) for base>=6.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]`-$[(i+1)mod N]`>6)+($[(i+1)mod N]`-$[i]`>6))

Crossrefs

Sequence in context: A295211 A261759 A156150 * A138440 A307008 A161347

Adjacent sequences: A125416 A125417 A125418 * A125420 A125421 A125422

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved