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

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =5a(5) =10a(6) =16a(7) =25a(8) =42a(9) =68a(10) =109a(11) =178a(12) =288a(13) =465a(14) =754a(15) =1220a(16) =1973a(17) =3194a(18) =5168a(19) =8361a(20) =13530a(21) =21892a(22) =35421a(23) =57314a(24) =92736a(25) =150049a(26) =242786a(27) =392836a(28) =635621a(29) =1028458