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Search: id:A126399
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| A126399 |
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Number of base 12 n-digit numbers with adjacent digits differing by two or less. |
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+0
4
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| 1, 12, 54, 250, 1168, 5486, 25848, 122024, 576748, 2728038, 12909648, 61108496, 289310874, 1369855464, 6486547342, 30716393200, 145458062754, 688830120102, 3262050022332, 15447978818780, 73156731187376, 346447866034700
(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 12 differing by one or less A126366.
Sequence in context: A025204 A005549 A124858 this_sequence A137938 A009726 A009653
Adjacent sequences: A126396 A126397 A126398 this_sequence A126400 A126401 A126402
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KEYWORD
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nonn
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AUTHOR
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Ron Hardin (rhh(AT)cadence.com), Dec 28 2006
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