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A107871
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Column 0 of triangle A107870; a(n) = C( n*(n-1)/2 + n+2, n).
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2
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1, 3, 10, 56, 495, 6188, 100947, 2035800, 48903492, 1362649145, 43183019880, 1533058025824, 60246643120300, 2595612872743443, 121623751733457400, 6156937298378625264, 334817778672726215400, 19463553270556728904725
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OFFSET
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0,2
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LINKS
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PROG
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(PARI) a(n)=binomial(n*(n-1)/2+n+2, n)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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