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Search: id:A126414
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| A126414 |
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Number of base 27 n-digit numbers with adjacent digits differing by two or less. |
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+0
4
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| 1, 27, 129, 625, 3043, 14861, 72723, 356399, 1748605, 8586905, 42198735, 207504135, 1020887305, 5024819575, 24741667433, 121865892063, 600430229661, 2959070561939, 14586392574071, 71916648942815, 354642311037069
(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)+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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PROGRAM
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(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
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Cf. Base 27 differing by one or less A126381.
Sequence in context: A026917 A048615 A124955 this_sequence A066414 A042422 A129028
Adjacent sequences: A126411 A126412 A126413 this_sequence A126415 A126416 A126417
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KEYWORD
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nonn,base
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AUTHOR
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Ron Hardin (rhhardin(AT)att.net), Dec 28 2006
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