Write an explicit and a recursive formula for the sequence.
4, 11, 18, 25, 32, ...

32,25,18,11,4

A blood type (also known as a blood group) is a classification of blood, based on the presence and absence of antibodies and inherited antigenic substances on the surface of red blood cells (RBCs). These antigens may be proteins, carbohydrates, glycoproteins, or glycolipids, depending on the blood group system.