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A124973
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a(n) = Sum_{0 <= k < n/2} a(k)a(n-1-k), with a(0) = a(1) = 1.
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2
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1, 1, 1, 1, 2, 3, 6, 11, 22, 42, 87, 174, 365, 745, 1587, 3303, 7103, 14974, 32477, 69284, 151172, 325077, 713400, 1545719, 3406989, 7423648, 16429555, 35992438, 79912474, 175785514, 391488688, 864591621, 1930333822, 4276537000
(list; graph; refs; listen; history; internal format)
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