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1, 3, 6, 10, 21, 36, 55, 78, 105, 136, 171, 210, 253, 300, 351
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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FORMULA
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Conjectures (Start)
G.f.: x*(1 + 6*x^4 - 3*x^5) / (1 - x)^3.
a(n) = 6 - 7*n + 2*n^2 for n>3.
a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3) for n>3.
(End)
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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