Norm of coefficients in the expansion of 1 / (1 - x - 2*I*x^2), where I^2=-1.

Terms

a(0) =1a(1) =1a(2) =5a(3) =17a(4) =45a(5) =185a(6) =533a(7) =1921a(8) =6205a(9) =20745a(10) =69541a(11) =229585a(12) =769613a(13) =2552537a(14) =8515125a(15) =28340513a(16) =94357853a(17) =314301865a(18) =1046284741a(19) =3484682865a(20) =11602442605a(21) =38636214649a(22) =128653931093a(23) =428398492865