Expansion of (1-x-2x^2+sqrt(1-2x-3x^2))/(2(1-x)(1-2x-3x^2)).

Terms

a(0) =1a(1) =2a(2) =5a(3) =13a(4) =36a(5) =102a(6) =294a(7) =855a(8) =2502a(9) =7352a(10) =21670a(11) =64021a(12) =189489a(13) =561680a(14) =1666955a(15) =4952243a(16) =14725010a(17) =43815836a(18) =130462322a(19) =388670993a(20) =1158491411a(21) =3454558976a(22) =10305303341a(23) =30752447207a(24) =91798204811a(25) =274101391202a(26) =818652308999