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Search: id:A126525
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| A126525 |
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Number of base 30 n-digit numbers with adjacent digits differing by four or less. |
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+0
2
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| 1, 30, 250, 2130, 18290, 157782, 1365186, 11836674, 102784246, 893546734, 7774696328, 67691981738, 589674316476, 5138751184130, 44795493135264, 390582096696514, 3406186539096420, 29708773287301186, 259147729207407892
(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)+9^(n-1) for base>=4n-3; a(base,n)=a(base-1,n)+9^(n-1)-2 when base=4n-4
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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]`-$[i+1]`>4)+($[i+1]`-$[i]`>4))
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CROSSREFS
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Cf. Base 30 differing by three or less A126498, two or less A126417, one or less A126384.
Sequence in context: A042752 A024448 A125367 this_sequence A053358 A113754 A129029
Adjacent sequences: A126522 A126523 A126524 this_sequence A126526 A126527 A126528
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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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