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

Terms

a(0) =1a(1) =9a(2) =90a(3) =154a(4) =779a(5) =995a(6) =3396a(7) =3908a(8) =10469a(9) =11469a(10) =26110a(11) =27838a(12) =56399a(13) =59143a(14) =109768a(15) =113864a(16) =197385a(17) =203217a(18) =333538a(19) =341538a(20) =536019a(21) =546667a(22) =826508a(23) =840332a(24) =1230957a(25) =1248533a(26) =1779974a(27) =1801926a(28) =2509207a(29) =2536207