Transform of the finite sequence (1, 0, -1, 0, 1) by the T_{1,1} transformation (see link).

Terms

a(0) =2a(1) =4a(2) =9a(3) =23a(4) =55a(5) =126a(6) =292a(7) =679a(8) =1579a(9) =3671a(10) =8534a(11) =19839a(12) =46120a(13) =107216a(14) =249247a(15) =579429a(16) =1347009a(17) =3131416a(18) =7279659a(19) =16923154a(20) =39341560a(21) =91458031a(22) =212614127a(23) =494267879a(24) =1149033414a(25) =2671178611a(26) =6209736884a(27) =14435886844a(28) =33559365375a(29) =78016059321