**Even triangle !n. This table read by rows gives the coefficients of sum formulae of n-th Left factorials (A003422). The k-th row (6>=k>=1) contains T(i,k) for i=1 to k+2, where k=[2*n+1+(-1)^(n-1)]/4 and T(i,k) satisfies !n = Sum_{i=1..k+2} T(i,k) * n^(i-1) / (2*k-2)!.**

*0, 1, 0, 16, 5, 1, 0, 5256, 3068, 276, 32, 0, 2070720, 2367420, 912150, 53220*

*2 seqfan posts*

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

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