a(n)=a(n-1)+a(n-2)+n+4, a(0)=0, a(1)=1.

Terms

a(0) =0a(1) =1a(2) =7a(3) =15a(4) =30a(5) =54a(6) =94a(7) =159a(8) =265a(9) =437a(10) =716a(11) =1168a(12) =1900a(13) =3085a(14) =5003a(15) =8107a(16) =13130a(17) =21258a(18) =34410a(19) =55691a(20) =90125a(21) =145841a(22) =235992a(23) =381860a(24) =617880a(25) =999769a(26) =1617679a(27) =2617479a(28) =4235190a(29) =6852702