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A027909
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T(2n,n-1), T given by A027907.
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0
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1, 4, 21, 112, 615, 3432, 19383, 110448, 633726, 3656360, 21191555, 123286440, 719539015, 4210967880, 24702429825, 145210795200, 855172338570, 5044470461352
(list; graph; refs; listen; history; internal format)
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