References to A109822

Triangle read by rows: T(n,1)=1, T(n,k)=T(n-1,k)+(n-1)T(n-1,k-1) for 1<=k<=n.
1, 1, 2, 1, 4, 6, 1, 7, 18, 24, 1, 11, 46, 96, 120, 1, 16, 101, 326, 600, 720, 1, 22, 197

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