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Search: id:A026121
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| 0, 3, 36, 351, 3240, 29403, 265356, 2390391, 21520080, 193700403, 1743362676, 15690441231, 141214502520, 1270932117003, 11438393835996, 102945558872871, 926510072902560, 8338590785263203, 75047317454789316, 675425858255365311
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OFFSET
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0,2
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FORMULA
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a(n)=C(3^n,2),n>=0. - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 07 2008
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MAPLE
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seq(binomial(3^n, 2), n=0..19); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 07 2008
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CROSSREFS
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Sequence in context: A038146 A067444 A092648 this_sequence A055303 A068177 A099670
Adjacent sequences: A026118 A026119 A026120 this_sequence A026122 A026123 A026124
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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