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A125482
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Number of base 25 circular n-digit numbers with adjacent digits differing by 9 or less.
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0
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1, 25, 385, 5065, 76525, 1181425, 18604423, 296112247, 4744131669, 76303192831, 1230058291235, 19856107505193, 320778775336579, 5184630615057399, 83819930402329583, 1355330682961353565, 21917107528759829589
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OFFSET
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0,2
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COMMENTS
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[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
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LINKS
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PROG
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(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))
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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