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A104629
Expansion of (1-2x-sqrt(1-4x))/(1+2x+sqrt(1-4x))/x^2.
+0
4
1, 2, 6, 18, 57, 186, 622, 2120, 7338, 25724, 91144, 325878, 1174281, 4260282, 15548694, 57048048, 210295326, 778483932, 2892818244, 10786724388, 40347919626, 151355847012, 569274150156, 2146336125648, 8110508473252
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Maintained by
N. J. A. Sloane
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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.
AT&T Labs Research
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