Expansion of (1-2x-sqrt(1-4x+4x^2-4x^3))/(2x^2).

Terms

a(0) =1a(1) =2a(2) =4a(3) =9a(4) =22a(5) =56a(6) =146a(7) =388a(8) =1048a(9) =2869a(10) =7942a(11) =22192a(12) =62510a(13) =177308a(14) =506008a(15) =1451866a(16) =4185788a(17) =12119696a(18) =35227748a(19) =102753800a(20) =300672368a(21) =882373261a(22) =2596389190a(23) =7658677856a(24) =22642421206a(25) =67081765932a(26) =199128719896a(27) =592179010350