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COMMENTS
| a(n) = Determinant(A+A^2+ A^3+ A^4+ A^5+... A^n)
where A is the submatrix A(1..3,1..3)= of the matrix with factorial determinant
A = [[1,1,1,1,1,1,...],[1,2,1,2,1,2,...],[1,2,3,1,2,3,...],[1,2,3,4,1,2,...], [1,2,3,4,5,1,...],[1,2,3,4,5,6,...],...] note: Determinant A(1..n,1..n) = (n-1)!.
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