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A027508
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Second column of A027495.
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0
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1, 21, 227, 4283, 3303383, 4156965497, 2439821215787, 25768363425203859, 2832420937806122764581, 4560420339293289548844701, 1405739820979794860218217874663237, 16339745488551090702175554269302914589235, 511682012237090112121527245846398145676326299
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listen;
history;
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OFFSET
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2,2
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LINKS
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FORMULA
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Numerators of sequence a[ 2, n ] in (a[ i, j ])^2 where a[ i, j ] = S(i, j)/BellNumber(i) if j<=i, 0 if j>i.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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