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Search: id:A126417
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| A126417 |
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Number of base 30 n-digit numbers with adjacent digits differing by two or less. |
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+0
4
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| 1, 30, 144, 700, 3418, 16736, 82098, 403274, 1982980, 9758780, 48058110, 236801010, 1167371680, 5757241450, 28403776808, 140176438936, 691982963722, 3416834220692, 16875210619810, 83360735329998, 411862694955416
(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 30 differing by one or less A126384.
Sequence in context: A158462 A064495 A124958 this_sequence A135175 A042760 A042762
Adjacent sequences: A126414 A126415 A126416 this_sequence A126418 A126419 A126420
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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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