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A135757
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Central binomial coefficients at triangular positions: a(n) = A000984(n(n+1)/2).
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2
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1, 2, 20, 924, 184756, 155117520, 538257874440, 7648690600760440, 442512540276836779204, 103827421287553411369671120, 98527218530093856775578873054432
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