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A027318
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a(n) = Sum_{k=0..m-3} T(n,k) * T(n,k+2), where m=n for n=0,1,2,3; m=2n for n >= 4; and T is given by A026082.
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0
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1, 42, 420, 3786, 33648, 297940, 2633872, 23265744, 205446960, 1814136746, 16021697220, 141535810130, 1250763720312, 11057433981126, 97794407702052, 865284559977150, 7659315417653664, 67827407480624862, 600898634852988364, 5325658497658529790
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OFFSET
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3,2
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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