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Search: id:A125466
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| A125466 |
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Number of base 31 circular n-digit numbers with adjacent digits differing by 8 or less. |
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+0
1
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| 1, 31, 455, 5503, 77399, 1110451, 16305215, 242704675, 3649992607, 55305511789, 842747008815, 12896518373649, 197988896900735, 3046905470601517, 46975007273893153, 725216490511279543, 11207606597478569967
(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: A022723 A084234 A118196 this_sequence A142280 A010947 A022626
Adjacent sequences: A125463 A125464 A125465 this_sequence A125467 A125468 A125469
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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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