Expansion of (2-sqrt(1+4x))/(2-x-sqrt(1+4x)).

Terms

a(0) =1a(1) =1a(2) =3a(3) =7a(4) =19a(5) =45a(6) =123a(7) =285a(8) =807a(9) =1771a(10) =5407a(11) =10587a(12) =37627a(13) =57619a(14) =279783a(15) =231615a(16) =2307339a(17) =-387531a(18) =21769251a(19) =-28249347a(20) =235837791a(21) =-539858235a(22) =2857845723a(23) =-8509970007a(24) =37342507167a(25) =-126289733319a(26) =510715973643