login
A125444
Number of base 32 circular n-digit numbers with adjacent digits differing by 7 or less.
0
1, 32, 424, 4568, 57432, 735592, 9646648, 128268424, 1723898392, 23355640616, 318418881444, 4362769334956, 60013762678824, 828186113644064, 11458464283369534, 158866331111116138, 2206333146498574632
OFFSET
0,2
COMMENTS
[Empirical] a(base,n)=a(base-1,n)+F(7) for base>=7.int(n/2)+1 and F(d) is the largest coefficient in (1+x+...+x^(2d))^n
PROG
(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>7)+($[(i+1)mod N]`-$[i]`>7))
CROSSREFS
Sequence in context: A145403 A125116 A145217 * A022692 A160142 A159544
KEYWORD
nonn,base
AUTHOR
R. H. Hardin, Dec 28 2006
STATUS
approved