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Search: id:A125450
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| A125450 |
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Number of base 15 circular n-digit numbers with adjacent digits differing by 8 or less. |
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+0
1
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| 1, 15, 183, 2031, 24907, 309275, 3863091, 48336527, 605167019, 7578088593, 94901326543, 1188486366599, 14883984640087, 186399715293651, 2334380328957769, 29234663364972731, 366120980626529371
(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(8) for base>=8.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]`-$[(i+1)mod N]`>8)+($[(i+1)mod N]`-$[i]`>8))
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CROSSREFS
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Sequence in context: A005461 A138443 A016158 this_sequence A079516 A016207 A016147
Adjacent sequences: A125447 A125448 A125449 this_sequence A125451 A125452 A125453
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhh(AT)cadence.com), Dec 28 2006
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