Squares of even tetrahedral numbers (A015220).

Terms

a(0) =0a(1) =16a(2) =100a(3) =400a(4) =3136a(5) =7056a(6) =14400a(7) =48400a(8) =81796a(9) =132496a(10) =313600a(11) =462400a(12) =665856a(13) =1299600a(14) =1768900a(15) =2371600a(16) =4096576a(17) =5290000a(18) =6760000a(19) =10732176a(20) =13351716a(21) =16483600a(22) =24601600a(23) =29767936a(24) =35808256a(25) =50979600a(26) =60372900a(27) =71166096a(28) =97614400a(29) =113635600