Squares of even hexagonal pyramidal numbers.

Terms

a(0) =484a(1) =2500a(2) =63504a(3) =138384a(4) =894916a(5) =1493284a(6) =5569600a(7) =8156736a(8) =22562500a(9) =30580900a(10) =70090384a(11) =90250000a(12) =181764324a(13) =225660484a(14) =413552896a(15) =499611904a(16) =852056100a(17) =1007808516a(18) =1624090000a(19) =1888771600a(20) =2907582084a(21) =3335062500a(22) =4943777344a(23) =5605816384a(24) =8050755076