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A028303
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Floor((1/(ceil(n/2)+1))*binomial(n,floor(n/2))) (interpolates between Catalan numbers).
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0
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1, 0, 1, 1, 2, 2, 5, 7, 14, 21, 42, 66, 132, 214, 429, 715, 1430, 2431, 4862, 8398, 16796, 29393, 58786, 104006, 208012, 371450, 742900, 1337220, 2674440, 4847422, 9694845, 17678835, 35357670, 64822395
(list; graph; refs; listen; history; internal format)
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