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Search: id:A122709
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| 1, 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, 411, 420, 429, 438, 447, 456, 465, 474, 483
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(0)=1, a(n)=9*n-3=A008591(n)-3 for n>0 . a(0)=1, a(1)=6, a(2)=15, a(n)=2*a(n-1)-a(n-2) for n>2 . a(0)=1, a(1)=6, a(n)=a(n-1)+9 for n>1 . G.f. ((1+2*x)/(1-x))^2.
Equals binomial transform of [1, 5, 4, -4, 4, -4, 4,...]. - Gary W. Adamson (qntmpkt(AT)yahoo.com), Dec 10 2007
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CROSSREFS
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Sequence in context: A043477 A055040 A017233 this_sequence A052220 A064565 A051940
Adjacent sequences: A122706 A122707 A122708 this_sequence A122710 A122711 A122712
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KEYWORD
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nonn
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Sep 23 2006
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