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

Terms

a(0) =4a(1) =12a(2) =36a(3) =104a(4) =288a(5) =780a(6) =2080a(7) =5472a(8) =14240a(9) =36736a(10) =94080a(11) =239440a(12) =606144a(13) =1527360a(14) =3833024a(15) =9584768a(16) =23890944a(17) =59380160a(18) =147207168a(19) =364084224a(20) =898569216a(21) =2213388288a(22) =5442392064a(23) =13360097536a(24) =32746992640a(25) =80153705472a(26) =195933828096a(27) =478374127616