Squares of tetrahedral numbers: a(n) = binomial(n+3,n)^2.

Terms

a(0) =1a(1) =16a(2) =100a(3) =400a(4) =1225a(5) =3136a(6) =7056a(7) =14400a(8) =27225a(9) =48400a(10) =81796a(11) =132496a(12) =207025a(13) =313600a(14) =462400a(15) =665856a(16) =938961a(17) =1299600a(18) =1768900a(19) =2371600a(20) =3136441a(21) =4096576a(22) =5290000a(23) =6760000a(24) =8555625a(25) =10732176a(26) =13351716a(27) =16483600a(28) =20205025a(29) =24601600