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A126481
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Number of base 13 n-digit numbers with adjacent digits differing by three or less.
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2
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1, 13, 79, 497, 3159, 20181, 129205, 828005, 5308457, 34039495, 218289367, 1399900567, 8977768487, 57576133509, 369247743009, 2368065719909, 15186926536617, 97397125090807, 624629410666375, 4005887424197615
(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)+7^(n-1) for base>=3n-2; a(base,n)=a(base-1,n)+7^(n-1)-2 when base=3n-3
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PROG
| (S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-2](($[i]`-$[i+1]`>3)+($[i+1]`-$[i]`>3))
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CROSSREFS
| Cf. Base 13 differing by two or less A126400, one or less A126367.
Sequence in context: A081584 A125323 A075584 * A032625 A120782 A032652
Adjacent sequences: A126478 A126479 A126480 * A126482 A126483 A126484
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KEYWORD
| nonn,base
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net), Dec 27 2006
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