Jour. Combin. Theory (A), Vol. 78, (1), 1997.
I am grateful to Doron Zeilberger for writing the accompanying Maple Package rabbit, and also for the input file for the identity (Rabbit).
I wish to thank J. Propp for letting us include the reference [P] of the conjecture.
Also, by kind permission of C. Krattenthaler the reference [K] is included .
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