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Search: id:A125437
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| A125437 |
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Number of base 25 circular n-digit numbers with adjacent digits differing by 7 or less. |
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+0
1
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| 1, 25, 319, 3385, 41647, 522925, 6717127, 87439069, 1149386407, 15213415573, 202370895399, 2701584846557, 36157460122255, 484806234281277, 6508805756745191, 87464954360562805, 1176115987345565255
(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(7) for base>=7.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]`-$[(i+1)mod N]`>7)+($[(i+1)mod N]`-$[i]`>7))
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CROSSREFS
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Sequence in context: A042206 A128377 A053805 this_sequence A077503 A020275 A020233
Adjacent sequences: A125434 A125435 A125436 this_sequence A125438 A125439 A125440
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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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