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A125482
Number of base 25 circular n-digit numbers with adjacent digits differing by 9 or less.
0
1, 25, 385, 5065, 76525, 1181425, 18604423, 296112247, 4744131669, 76303192831, 1230058291235, 19856107505193, 320778775336579, 5184630615057399, 83819930402329583, 1355330682961353565, 21917107528759829589
OFFSET
0,2
COMMENTS
[Empirical] a(base,n)=a(base-1,n)+F(9) for base>=9.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]`-$[(i+1)mod N]`>9)+($[(i+1)mod N]`-$[i]`>9))
CROSSREFS
Sequence in context: A069396 A228216 A261485 * A306322 A344733 A028130
KEYWORD
nonn,base
AUTHOR
R. H. Hardin, Dec 28 2006
STATUS
approved