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Search: id:A125419
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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
1
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| 1, 31, 361, 3391, 37237, 416111, 4761901, 55250583, 648017421, 7662743017, 91199048321, 1091067528549, 13108510159921, 158042063686499, 1910968040115173, 23162642662833881, 281323809804798781
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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[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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PROGRAM
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(S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-1](($[i]`-$[(i+1)mod N]`>6)+($[(i+1)mod N]`-$[i]`>6))
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CROSSREFS
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Sequence in context: A142495 A100728 A156150 this_sequence A138440 A161347 A107941
Adjacent sequences: A125416 A125417 A125418 this_sequence A125420 A125421 A125422
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhhardin(AT)att.net), Dec 28 2006
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