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Search: id:A133647
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OFFSET
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0,2
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COMMENT
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A133646 is a companion case.
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FORMULA
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A133566 * A000244, where A133566 = an infinite lower triangular matrix, and A000244 = [3^0, 3^1, 3^2,...]. For odd n, a(n) = 3^n. For even n, a(n) = 4 * 3^(n-1).
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EXAMPLE
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a(3) = 27 = 3^3.
a(4) = 108 = 4 * 3^3.
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CROSSREFS
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Cf. A133566, A133646, A000244.
Sequence in context: A018230 A058034 A009259 this_sequence A009222 A083543 A083538
Adjacent sequences: A133644 A133645 A133646 this_sequence A133648 A133649 A133650
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KEYWORD
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nonn
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Sep 19 2007
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