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

Terms

a(0) =1a(1) =3a(2) =30a(3) =34a(4) =159a(5) =165a(6) =508a(7) =516a(8) =1245a(9) =1255a(10) =2586a(11) =2598a(12) =4795a(13) =4809a(14) =8184a(15) =8200a(16) =13113a(17) =13131a(18) =19990a(19) =20010a(20) =29271a(21) =29293a(22) =41460a(23) =41484a(24) =57109a(25) =57135a(26) =76818a(27) =76846a(28) =101235a(29) =101265