a(0) = 5, a(1) = 7; for n>1, a(n) = a(n-1)+a(n-2)-(2n-2).

Terms

a(0) =5a(1) =7a(2) =10a(3) =13a(4) =17a(5) =22a(6) =29a(7) =39a(8) =54a(9) =77a(10) =113a(11) =170a(12) =261a(13) =407a(14) =642a(15) =1021a(16) =1633a(17) =2622a(18) =4221a(19) =6807a(20) =10990a(21) =17757a(22) =28705a(23) =46418a(24) =75077a(25) =121447a(26) =196474a(27) =317869a(28) =514289a(29) =832102