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

Terms

a(0) =1a(1) =3a(2) =9a(3) =26a(4) =69a(5) =186a(6) =511a(7) =1401a(8) =3824a(9) =10438a(10) =28521a(11) =77938a(12) =212928a(13) =581700a(14) =1589231a(15) =4341911a(16) =11862339a(17) =32408429a(18) =88541424a(19) =241899801a(20) =660882666a(21) =1805564823a(22) =4932894579a(23) =13476918898a(24) =36819627664a(25) =100593093135a(26) =274825440378a(27) =750837066710