W_{4,48}=1 + alpha*y^16 + (32533776 - 16*alpha)*y^18 + (321057000 + 120*alpha)*y^20 + (6538354992 - 560*alpha)*y^22 + (63324394380 + 1820*alpha)*y^24 + (497930686992 - 4368*alpha)*y^26 + (2714283514008 + 8008*alpha)*y^28 + (10702668824496 - 11440*alpha)*y^30 + (29678410515501 + 12870*alpha)*y^32 + (57163456332720 - 11440*alpha)*y^34 + (74293883912664 + 8008*alpha)*y^36 + (62784083316240 - 4368*alpha)*y^38 + (32595760120572 + 1820*alpha)*y^40 + (9541274664240 - 560*alpha)*y^42 + (1361387920680 + 120*alpha)*y^44 + (71055167760 - 16*alpha)*y^46 + (565394634 + alpha)*y^48