Expansion of 1/((1-x)*(1-x^2))^4.

Terms

a(0) =1a(1) =4a(2) =14a(3) =36a(4) =85a(5) =176a(6) =344a(7) =624a(8) =1086a(9) =1800a(10) =2892a(11) =4488a(12) =6798a(13) =10032a(14) =14520a(15) =20592a(16) =28743a(17) =39468a(18) =53482a(19) =71500a(20) =94523a(21) =123552a(22) =159952a(23) =205088a(24) =260780a(25) =328848a(26) =411672a(27) =511632a(28) =631788a(29) =775200