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A137647
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a(n) = Sum_{k=0..n} C(k(k+1), k) * C(k(k+1), n-k).
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0
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1, 2, 19, 312, 7710, 254226, 10490141, 519862812, 30075235131, 1989376821840, 148089577059957, 12251856625291758, 1115218087275339166, 110758226370052793778, 11918195995470354683205
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