a(n) = n*(n+1)^2.

Terms

a(0) =4a(1) =18a(2) =48a(3) =100a(4) =180a(5) =294a(6) =448a(7) =648a(8) =900a(9) =1210a(10) =1584a(11) =2028a(12) =2548a(13) =3150a(14) =3840a(15) =4624a(16) =5508a(17) =6498a(18) =7600a(19) =8820a(20) =10164a(21) =11638a(22) =13248a(23) =15000a(24) =16900a(25) =18954a(26) =21168a(27) =23548a(28) =26100a(29) =28830