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Search: id:A081279
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| 1, 8, 47, 238, 1101, 4788, 19899, 79866, 311769, 1189728, 4454919, 16415622, 59659173, 214229772, 761200659, 2679525522, 9353893041, 32409397944, 111534054111, 381480041502, 1297471217661, 4390248981348, 14785128121707
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OFFSET
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0,2
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FORMULA
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a(n) = (2n^3+30n^2 + 103n + 81)3^(n - 4). a(n) = 12a(n-1)-54a(n-2)+108a(n-3)+81a(n-4), a(0)=1, a(1)=8, a(2)=47, a(3)=238. G.f.: (1-2x)(1-x)^2/(1-3x)^4.
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CROSSREFS
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Cf. A007051, A006234, A081278, A081280.
Sequence in context: A132113 A085299 A026983 this_sequence A099110 A106393 A139262
Adjacent sequences: A081276 A081277 A081278 this_sequence A081280 A081281 A081282
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Mar 16 2003
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