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0, 5, 495, 48510, 4753490, 465793515, 45643010985, 4472549283020, 438264186724980, 42945417749765025, 4208212675290247475, 412361896760694487530, 40407257669872769530470, 3959498889750770719498535, 387990483937905657741325965, 38019107927025003687930446040
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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COMMENTS
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Halves of triangular numbers which are also thirds of triangular numbers.
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LINKS
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FORMULA
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a(n) = 99*a(n-1) - 99*a(n-2) + a(n-3) for n > 2.
G.f.: -5*x/((x - 1)*(x^2 - 98*x + 1)). (End)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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