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A125419
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Number of base 31 circular n-digit numbers with adjacent digits differing by 6 or less.
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0
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1, 31, 361, 3391, 37237, 416111, 4761901, 55250583, 648017421, 7662743017, 91199048321, 1091067528549, 13108510159921, 158042063686499, 1910968040115173, 23162642662833881, 281323809804798781
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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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
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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))
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CROSSREFS
| Sequence in context: A100728 A197644 A156150 * A138440 A161347 A107941
Adjacent sequences: A125416 A125417 A125418 * A125420 A125421 A125422
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KEYWORD
| nonn,base
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net), Dec 28 2006
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