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A107872
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Column 1 of triangle A107870; a(n) = C( n*(n+1)/2 + n+2, n).
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2
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1, 4, 21, 165, 1820, 26334, 475020, 10295472, 260932815, 7575968400, 247994680648, 9036996468045, 362827605867363, 15913388077274800, 757000487505568680, 38819452599736372800, 2134712294190092847615
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