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Search: id:A125454
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| A125454 |
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Number of base 19 circular n-digit numbers with adjacent digits differing by 8 or less. |
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+0
1
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| 1, 19, 251, 2899, 38027, 509239, 6922823, 94744711, 1301066891, 17895943729, 246351600811, 3392528778229, 46727519959343, 643666830505159, 8866832290305149, 122147626590349999, 1682697341501872923
(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: A017998 A018912 A021202 this_sequence A009762 A017952 A055433
Adjacent sequences: A125451 A125452 A125453 this_sequence A125455 A125456 A125457
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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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