( n, k, d) Just the check bits; append an identity matrix for data bits
(27, 1,27)  0x0000000003ffffff  0000000000000000000000000000000000000011111111111111111111111111
(41, 2,27)  0x0000007ffc001fff  0000000000000000000000000111111111111100000000000001111111111111
(48, 3,27)  0x00001f81fc0fe03f  0000000000000000000111111000000111111100000011111110000000111111