Nearest integer to (n/2)^4.

Terms

a(0) =0a(1) =0a(2) =1a(3) =5a(4) =16a(5) =39a(6) =81a(7) =150a(8) =256a(9) =410a(10) =625a(11) =915a(12) =1296a(13) =1785a(14) =2401a(15) =3164a(16) =4096a(17) =5220a(18) =6561a(19) =8145a(20) =10000a(21) =12155a(22) =14641a(23) =17490a(24) =20736a(25) =24414a(26) =28561a(27) =33215a(28) =38416a(29) =44205