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

Terms

a(0) =2a(1) =6a(2) =16a(3) =46a(4) =132a(5) =376a(6) =1074a(7) =3066a(8) =8752a(9) =24986a(10) =71328a(11) =203624a(12) =581298a(13) =1659462a(14) =4737360a(15) =13524006a(16) =38607732a(17) =110215648a(18) =314638754a(19) =898216794a(20) =2564189568a(21) =7320134930a(22) =20897197344a(23) =59656394448a(24) =170304435554a(25) =486177568038