** Pascal matrix. **

** 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 **

** inverse). **

** PASCAL(N,2) is a transposed and permuted version of PASCAL(N,1) **

** which is a cube root of the identity. **

** **