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Search: id:A037480
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| A037480 |
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Base-3 digits are, in order, the first n terms of the periodic sequence with initial period 1,2. |
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+0
3
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| 1, 5, 16, 50, 151, 455, 1366, 4100, 12301, 36905, 110716, 332150, 996451, 2989355, 8968066, 26904200, 80712601, 242137805, 726413416, 2179240250, 6537720751, 19613162255, 58839486766, 176518460300, 529555380901
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OFFSET
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1,2
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FORMULA
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a(n) = (5*3^n + (-1)^n - 6)/8 . - Paul D. Hanna (pauldhanna(AT)juno.com), Sep 23 2007
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MAPLE
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a[0]:=0:a[1]:=1:for n from 2 to 50 do a[n]:=2*a[n-1]+3*a[n-2]+3 od: seq(a[n], n=1..33); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Dec 14 2008]
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CROSSREFS
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Sequence in context: A082001 A084356 A007806 this_sequence A027108 A077840 A007343
Adjacent sequences: A037477 A037478 A037479 this_sequence A037481 A037482 A037483
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KEYWORD
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nonn,base
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu)
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