a(1)=1, a(n)=a(n-1)+n^2 if n odd, a(n)=a(n-1)+ n^3 if n is even.

Terms

a(0) =1a(1) =9a(2) =18a(3) =82a(4) =107a(5) =323a(6) =372a(7) =884a(8) =965a(9) =1965a(10) =2086a(11) =3814a(12) =3983a(13) =6727a(14) =6952a(15) =11048a(16) =11337a(17) =17169a(18) =17530a(19) =25530a(20) =25971a(21) =36619a(22) =37148a(23) =50972a(24) =51597a(25) =69173a(26) =69902a(27) =91854a(28) =92695a(29) =119695