a(1)=1, a(n) = a(n-1) + n^3 if n odd, a(n) = a(n-1) + n^5 if n is even.

Terms

a(0) =1a(1) =33a(2) =60a(3) =1084a(4) =1209a(5) =8985a(6) =9328a(7) =42096a(8) =42825a(9) =142825a(10) =144156a(11) =392988a(12) =395185a(13) =933009a(14) =936384a(15) =1984960a(16) =1989873a(17) =3879441a(18) =3886300a(19) =7086300a(20) =7095561a(21) =12249193a(22) =12261360a(23) =20223984a(24) =20239609a(25) =32120985a(26) =32140668a(27) =49351036a(28) =49375425