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A037293
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Sum_{i=0}^{2^{n-1}} (2^{n-1} choose i)^2.
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2
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1, 2, 6, 70, 12870, 601080390, 1832624140942590534, 23951146041928082866135587776380551750, 5768658823449206338089748357862286887740211701975162032608436567264518750790
(list; graph; refs; listen; history; internal format)
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