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A051893
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a(n)=sum(i^2*a(i),i=1..n-1), a(1)=1;.
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1
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1, 1, 5, 50, 850, 22100, 817700, 40885000, 2657525000, 217917050000, 22009622050000, 2685173890100000, 389350214064500000, 66189536390965000000, 13039338669020105000000
(list; graph; refs; listen; history; internal format)
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