a(n+2) = a(n+1) + a(n) - (2*n + 1) where a(0)=7, a(1)=11.

Terms

a(0) =7a(1) =11a(2) =17a(3) =25a(4) =37a(5) =55a(6) =83a(7) =127a(8) =197a(9) =309a(10) =489a(11) =779a(12) =1247a(13) =2003a(14) =3225a(15) =5201a(16) =8397a(17) =13567a(18) =21931a(19) =35463a(20) =57357a(21) =92781a(22) =150097a(23) =242835a(24) =392887a(25) =635675a(26) =1028513a(27) =1664137a(28) =2692597a(29) =4356679