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Search: id:A125409
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| A125409 |
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Number of base 21 circular n-digit numbers with adjacent digits differing by 6 or less. |
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+0
1
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| 1, 21, 231, 2121, 22547, 244601, 2714271, 30517333, 346395491, 3958011609, 45437784111, 523343937005, 6041702589491, 69860441606457, 808706293207743, 9368913912846221, 108598284502838979, 1259272889680954201
(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: A126902 A010973 A022586 this_sequence A069601 A089937 A023019
Adjacent sequences: A125406 A125407 A125408 this_sequence A125410 A125411 A125412
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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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