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A126366
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Number of base 12 n-digit numbers with adjacent digits differing by one or less.
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4
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1, 12, 34, 98, 284, 826, 2408, 7032, 20562, 60186, 176312, 516844, 1515926, 4448336, 13058280, 38345702, 112633540, 330918226, 972433832, 2858069380, 8401323984, 24698783724, 72618671844, 213530132914, 627917268794
(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)+3^(n-1) for base>=n; a(base,n)=a(base-1,n)+3^(n-1)-2 when base=n-1
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PROG
| (S/R) stvar $[N]:(0..M-1) init $[]:=0 asgn $[]->{*} kill +[i in 0..N-2](($[i]`-$[i+1]`>1)+($[i+1]`-$[i]`>1))
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CROSSREFS
| Sequence in context: A142245 A139635 A124705 * A199114 A009760 A078194
Adjacent sequences: A126363 A126364 A126365 * A126367 A126368 A126369
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KEYWORD
| nonn,base
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net), Dec 26 2006
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