p-INVERT of (0,1,0,1,0,1,...), where p(S) = (1 - 2 S)^2.

Terms

a(0) =4a(1) =12a(2) =36a(3) =104a(4) =292a(5) =804a(6) =2180a(7) =5840a(8) =15492a(9) =40764a(10) =106532a(11) =276792a(12) =715556a(13) =1841748a(14) =4722180a(15) =12066208a(16) =30737924a(17) =78088812a(18) =197892388a(19) =500374024a(20) =1262618148a(21) =3180066180a(22) =7995639940a(23) =20071580784a(24) =50312160388a(25) =125942854044a(26) =314865132324a(27) =786254598872