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A126965
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(2*n)!*(2*n-1)/(2^n*n!).
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1
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-1, 1, 9, 75, 735, 8505, 114345, 1756755, 30405375, 585810225, 12439852425, 288735522075, 7273385294175, 197646339515625, 5763367260275625, 179518217255251875, 5948862302837829375, 208977775735174070625, 7757508341684492015625, 303429397707601987696875
(list; graph; refs; listen; history; internal format)
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