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Search: id:A097039
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| 0, 1, 7, 19, 47, 102, 210, 413, 789, 1473, 2703, 4892, 8756, 15529, 27331, 47791, 83103, 143810, 247814, 425445, 727985, 1241981, 2113247, 3587064, 6075432, 10269457, 17326975, 29185483, 49083599, 82429278, 138244218, 231565037
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OFFSET
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0,3
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FORMULA
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Ogf.: (t(-1-4t+t^2))/((-1+t)(-1+t+t^2)^2). a(n)=4+n*L(n+2)-L(n+3).
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MATHEMATICA
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l[n_] := l[n] = l[n - 1] + l[n - 2]; l[0] = 2; l[1] = 1 Table[Sum[k l[k], {k, 0, n}], {n, 0, 10}]
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CROSSREFS
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Adjacent sequences: A097036 A097037 A097038 this_sequence A097040 A097041 A097042
Sequence in context: A143128 A139865 A000491 this_sequence A067651 A090025 A003232
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KEYWORD
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easy,nonn
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AUTHOR
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Mario Catalani (mario.catalani(AT)unito.it), Jul 20 2004
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