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A125353
Number of base 16 circular n-digit numbers with adjacent digits differing by 4 or less.
0
1, 16, 124, 796, 5924, 44916, 348652, 2743036, 21801764, 174565444, 1405459324, 11362215276, 92138276228, 748875775404, 6097017988948, 49701864868956, 405539673414148, 3311264043438796, 27050524930821556, 221065493126829404
OFFSET
0,2
COMMENTS
[Empirical] a(base,n)=a(base-1,n)+A025014(n+1) for base>=4.int(n/2)+1
PROG
(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>4)+($[(i+1)mod N]`-$[i]`>4))
CROSSREFS
Sequence in context: A006215 A227088 A060633 * A126511 A231582 A067442
KEYWORD
nonn,base
AUTHOR
R. H. Hardin, Dec 28 2006
STATUS
approved