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A037293
Sum_{i=0}^{2^{n-1}} (2^{n-1} choose i)^2.
+0
3
1, 2, 6, 70, 12870, 601080390, 1832624140942590534, 23951146041928082866135587776380551750, 5768658823449206338089748357862286887740211701975162032608436567264518750790
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified November 27 14:50 EST 2009. Contains 167570 sequences.
AT&T Labs Research
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