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COMMENTS
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This is the column k=3 of an array T(n,k) = A181783(n,k) defined by T(n,0)=T(0,k)=1 and T(n,k) = n*(k-1)*T(n-1,k) +T(n,k-1), which starts
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,...
1, 1, 2, 4, 7, 11, 16, 22, 29, 37, 46,...
1, 1, 5, 21, 63, 151, 311, 575, 981,1573,2401,...
1, 1, 16, 142, 709,2521,7186,17536,38137,75889,140716,...
1, 1, 65,1201,9709,50045,193765,614629,1682465,4110913,9176689,...
Column k=2 is A000522. The e.g.f. for column k is E_k(z) = E_(k-1)(z)/[1-(k-1)] = exp(z)/prod_{j=1..k-1} (1-j*z). - Richard Choulet, Dec 17 2012
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