for( i = 2; i < n; i++ ) {
for( j = i + 1; j <= n; j++ ) {
coeffs( a[ i - 2 ][ i - 1 ], a[ i - 2 ][ j - 1 ], cp, sp, accuracy );
for( i = 2; i < n; i++ ) {
for( j = i + 1; j <= n; j++ ) {
coeffs( a[ i - 2 ][ i - 1 ], a[ i - 2 ][ j - 1 ], cp, sp, accuracy );