Expansion of (1+x)c(x^2)/((1-xc(x^2))*sqrt(1-4x^2)), c(x) the g.f. of A000108.

Terms

a(0) =1a(1) =2a(2) =5a(3) =9a(4) =21a(5) =38a(6) =86a(7) =157a(8) =349a(9) =642a(10) =1410a(11) =2610a(12) =5682a(13) =10572a(14) =22860a(15) =42717a(16) =91869a(17) =172298a(18) =368906a(19) =694054a(20) =1480486a(21) =2793012a(22) =5938740a(23) =11230834a(24) =23813746a(25) =45131348a(26) =95462996a(27) =181268292a(28) =382594884a(29) =727747608