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A036911
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(C(4*n,2*n)+(-1)^n*C(2*n,n)^2)/2.
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0
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1, 1, 53, 262, 8885, 60626, 1778966, 14168988, 383358645, 3355615450, 85990654178, 803232328548, 19780031677718, 193873026294052, 4629016098160220, 47101568276955512, 1096960888092571317, 11503661742608944170, 262435310495071434602
(list; graph; refs; listen; history; internal format)
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