p-INVERT of (0,1,0,1,0,1,...), where p(S) = 1 - 3 S + S^2.

Terms

a(0) =3a(1) =8a(2) =24a(3) =71a(4) =210a(5) =621a(6) =1836a(7) =5428a(8) =16047a(9) =47440a(10) =140247a(11) =414612a(12) =1225716a(13) =3623579a(14) =10712370a(15) =31668929a(16) =93622704a(17) =276776352a(18) =818232603a(19) =2418937120a(20) =7151092203a(21) =21140739568a(22) =62498266944a(23) =184763326671a(24) =546214936050