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Search: id:A017233
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| 6, 15, 24, 33, 42, 51, 60, 69, 78, 87, 96, 105, 114, 123, 132, 141, 150, 159, 168, 177, 186, 195, 204, 213, 222, 231, 240, 249, 258, 267, 276, 285, 294, 303, 312, 321, 330, 339, 348, 357, 366, 375, 384, 393, 402
(list; graph; listen)
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OFFSET
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0,1
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LINKS
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Tanya Khovanova, Recursive Sequences
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FORMULA
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a(n)=4*C(3*n,2)/C(2*n,1),n>=1 - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 02 2007
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MAPLE
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[seq(4*binomial(3*n, 2)/binomial(2*n, 1), n=1..45)]; - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 02 2007
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CROSSREFS
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Adjacent sequences: A017230 A017231 A017232 this_sequence A017234 A017235 A017236
Sequence in context: A095032 A043477 A055040 this_sequence A122709 A052220 A064565
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KEYWORD
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nonn,easy
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AUTHOR
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David J. Horn and Laura Krebs Gordon (Series615(AT)mail.com), 1985
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