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Search: id:A126367
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| A126367 |
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Number of base 13 n-digit numbers with adjacent digits differing by one or less. |
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+0
5
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| 1, 13, 37, 107, 311, 907, 2651, 7761, 22749, 66747, 195995, 575893, 1693073, 4979777, 14652601, 43128637, 126982109, 373962395, 1101557803, 3245398895, 9563118423, 28183332105, 83068897785, 244867352543, 721877651203
(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)+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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PROGRAM
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(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
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Sequence in context: A089528 A043190 A043970 this_sequence A139926 A139860 A036570
Adjacent sequences: A126364 A126365 A126366 this_sequence A126368 A126369 A126370
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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 26 2006
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