Expansion of 1/(1 - 2*x - 3*x^2)^(7/2).

Terms

a(0) =1a(1) =7a(2) =42a(3) =210a(4) =966a(5) =4158a(6) =17094a(7) =67782a(8) =261261a(9) =983983a(10) =3635632a(11) =13217568a(12) =47393892a(13) =167919948a(14) =588772152a(15) =2045481480a(16) =7048466271a(17) =24111291897a(18) =81939285582a(19) =276810647190a(20) =930096277110