p-INVERT of the positive integers, where p(S) = 1 - 2*S^2.

Terms

a(0) =0a(1) =2a(2) =8a(3) =24a(4) =72a(5) =222a(6) =688a(7) =2128a(8) =6576a(9) =20322a(10) =62808a(11) =194120a(12) =599960a(13) =1854270a(14) =5730912a(15) =17712288a(16) =54742624a(17) =169190722a(18) =522910632a(19) =1616137848a(20) =4994929128a(21) =15437616926a(22) =47712391952a(23) =147462678768a(24) =455756685840