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Search: id:A133694
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OFFSET
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1,2
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FORMULA
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a(n) = 3*T(n) - 2, where T(n) = n-th Triangular number of A000217. A133694 = binomial transform of [1, 6, 3, 0, 0, 0,...].
Row sums of triangle A133981 - Gary W. Adamson (qntmpkt(AT)yahoo.com), Sep 30 2007
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EXAMPLE
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a(3) = 16 = 3*T(3) - 2 = 3*6 - 2.
a(4) = 28 = (1, 3, 3, 1) dot (1, 6, 3, 0) = (1, 18, 9, 0) = 28.
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CROSSREFS
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Cf. A000217.
Cf. A133981.
Sequence in context: A052221 A119461 A028560 this_sequence A024627 A140511 A121470
Adjacent sequences: A133691 A133692 A133693 this_sequence A133695 A133696 A133697
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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 20 2007
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