Squares of even octagonal numbers.

Terms

a(0) =0a(1) =64a(2) =1600a(3) =9216a(4) =30976a(5) =78400a(6) =166464a(7) =313600a(8) =541696a(9) =876096a(10) =1345600a(11) =1982464a(12) =2822400a(13) =3904576a(14) =5271616a(15) =6969600a(16) =9048064a(17) =11560000a(18) =14561856a(19) =18113536a(20) =22278400a(21) =27123264a(22) =32718400a(23) =39137536a(24) =46457856a(25) =54760000