**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, 1, 1, 1, 2, 2, 1, 4, 6, 6, 1, 7, 18, 24, 24, 1, 11, 46, 96, 120, 120, 1, 16, 101, 326, 600*

*1 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

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