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Search: id:A126480
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| A126480 |
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Number of base 12 n-digit numbers with adjacent digits differing by three or less. |
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+0
3
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| 1, 12, 72, 448, 2816, 17780, 112440, 711504, 4503320, 28505304, 180439880, 1142206528, 7230339936, 45769222384, 289726772704, 1834018988272, 11609648360160, 73491027329888, 465210573030272, 2944861245639136
(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 12 differing by two or less A126399, one or less A126366.
Sequence in context: A035472 A036398 A125322 this_sequence A030235 A088166 A138402
Adjacent sequences: A126477 A126478 A126479 this_sequence A126481 A126482 A126483
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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 27 2006
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