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A113844
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a(1) =a(2) =1. a(n+1) = (sum{1<=k<=n/2} a(k)) * (sum{n/2<j<=n} a(j)).
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0
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1, 1, 1, 2, 6, 18, 78, 312, 2070, 12420, 163878, 1966536, 62213526, 1866405780, 206591803854, 22311914816232, 9436063264020024, 3963146570888410080, 9887814229774042889370, 24620657432137366794531300
(list; graph; refs; listen; history; internal format)
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