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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
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1, 21, 231, 2121, 22547, 244601, 2714271, 30517333, 346395491, 3958011609, 45437784111, 523343937005, 6041702589491, 69860441606457, 808706293207743, 9368913912846221, 108598284502838979, 1259272889680954201
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| [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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PROG
| (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
| Sequence in context: A162646 A010973 A022586 * A161581 A069601 A173347
Adjacent sequences: A125406 A125407 A125408 * A125410 A125411 A125412
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KEYWORD
| nonn,base
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net), Dec 28 2006
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