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A126402
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Number of base 15 n-digit numbers with adjacent digits differing by two or less.
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3
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1, 15, 69, 325, 1543, 7361, 35223, 168899, 811105, 3899407, 18761375, 90319881, 434998065, 2095690739, 10098729091, 48672013183, 234609419433, 1130969299775, 5452365150693, 26286944474683, 126739125460983
(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)+5^(n-1) for base>=2n-1; a(base,n)=a(base-1,n)+5^(n-1)-2 when base=2n-2
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PROG
| (S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-2](($[i]`-$[i+1]`>2)+($[i+1]`-$[i]`>2))
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CROSSREFS
| Cf. Base 15 differing by one or less A126369.
Sequence in context: A201126 A085474 A124893 * A053134 A000475 A145053
Adjacent sequences: A126399 A126400 A126401 * A126403 A126404 A126405
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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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