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A125403
Number of base 15 circular n-digit numbers with adjacent digits differing by 6 or less.
0
1, 15, 153, 1359, 13733, 141695, 1486035, 15703213, 166605917, 1771212519, 18849404803, 200701390047, 2137554688991, 22768882319185, 242546650726001, 2583827618792249, 27525752610673389, 293236893096648653
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
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: A041424 A021124 A004322 * A010035 A370765 A334356
KEYWORD
nonn,base
AUTHOR
R. H. Hardin, Dec 28 2006
STATUS
approved