A125391 Number of base 28 circular n-digit numbers with adjacent digits differing by 5 or less.

1, 28, 278, 2218, 20698, 196378, 1908368, 18800964, 187240242, 1880087458, 19001528288, 193056703076, 1969968657844, 20174161922072, 207225426515028, 2134025764850968, 22024156859681682, 227721370771551778

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: A065693 A349861 A159883 * A126549 A300297 A250649

Adjacent sequences: A125388 A125389 A125390 * A125392 A125393 A125394

Keyword

nonn,base

Author

R. H. Hardin, Dec 28 2006

Status

approved