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Search: id:A126495
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| A126495 |
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Number of base 27 n-digit numbers with adjacent digits differing by three or less. |
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+0
3
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| 1, 27, 177, 1183, 7961, 53795, 364489, 2474351, 16821389, 114483903, 779844261, 5315901159, 36257137597, 247407046293, 1688869025869, 11532291728235, 78767464674013, 538108605910885, 3676788059570219, 25126354998525521
(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)+7^(n-1) for base>=3n-2; a(base,n)=a(base-1,n)+7^(n-1)-2 when base=3n-3
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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]`-$[i+1]`>3)+($[i+1]`-$[i]`>3))
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CROSSREFS
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Cf. Base 27 differing by two or less A126414, one or less A126381.
Sequence in context: A055339 A083560 A125337 this_sequence A000499 A042416 A033544
Adjacent sequences: A126492 A126493 A126494 this_sequence A126496 A126497 A126498
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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 27 2006
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