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

Terms

a(0) =1a(1) =3a(2) =12a(3) =16a(4) =41a(5) =47a(6) =96a(7) =104a(8) =185a(9) =195a(10) =316a(11) =328a(12) =497a(13) =511a(14) =736a(15) =752a(16) =1041a(17) =1059a(18) =1420a(19) =1440a(20) =1881a(21) =1903a(22) =2432a(23) =2456a(24) =3081a(25) =3107a(26) =3836a(27) =3864a(28) =4705a(29) =4735