Heat 15 qts. (14 L) of water to 165 °F (74 °C) and stir in crushed grains and flaked maize. Mash at 154 °F (68 °C) for 60 minutes. Stir boiling water into mash to boost temperature to 168 °F (76 °C) and hold for 5 minutes. Recirculate for 20 minutes then begin running off wort. Sparge with 170 °F (77 °C) water. Boil wort for 90 minutes, adding hops to boil for the times indicated in recipe. Add yeast nutrients and Irish moss with 15 minutes left in boil. Cool wort and transfer to fermenter. Aerate wort and pitch yeast. Ferment at 70 °F (21 °C). Rack to secondary when fermentation is complete. Bottle or keg a few days later, when beer falls clear.
Note: use flaked maize, not corn. Maize was in in my list on this calculator.