a(1)=1, a(n)=a(n-1)+n^3 if n odd, a(n)=a(n-1)+ n^4 if n is even.

Terms

a(0) =1a(1) =17a(2) =44a(3) =300a(4) =425a(5) =1721a(6) =2064a(7) =6160a(8) =6889a(9) =16889a(10) =18220a(11) =38956a(12) =41153a(13) =79569a(14) =82944a(15) =148480a(16) =153393a(17) =258369a(18) =265228a(19) =425228a(20) =434489a(21) =668745a(22) =680912a(23) =1012688a(24) =1028313a(25) =1485289a(26) =1504972a(27) =2119628a(28) =2144017a(29) =2954017