PASCAL(N) is the Pascal matrix of order N: a symmetric positive
definite matrix with integer entries, made up from Pascal's
triangle. Its inverse has integer entries.
PASCAL(N,1) is the lower triangular Cholesky factor (up to signs
of columns) of the Pascal matrix. It is involutary (is its own
PASCAL(N,2) is a transposed and permuted version of PASCAL(N,1)
which is a cube root of the identity.