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A107868
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Column 0 of triangle A107867; a(n) = C( n*(n-1)/2 + n + 1, n).
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4
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1, 2, 6, 35, 330, 4368, 74613, 1560780, 38608020, 1101716330, 35607051480, 1285063345176, 51209646652255, 2232785266876080, 105710363656182600, 5399936810873056584, 295998326072989842600, 17328840976366636057110
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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+1, 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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