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A026000
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a(n) = T(2n,n), where T = Delannoy triangle (A008288).
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3
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1, 5, 41, 377, 3649, 36365, 369305, 3800305, 39490049, 413442773, 4354393801, 46082942185, 489658242241, 5220495115997, 55818956905529, 598318746037217, 6427269150511105, 69175175263888037, 745778857519239785
(list; graph; refs; listen; history; internal format)
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