Sum of absolute values of real and imaginary parts of the coefficients in the expansion of 1 / (1 - x - 2*I*x^2), where I^2=-1.
A218138
Sum of absolute values of real and imaginary parts of the coefficients in the expansion of 1 / (1 - x - 2*I*x^2), where I^2=-1.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =5a(4) =9a(5) =19a(6) =25a(7) =59a(8) =109a(9) =147a(10) =359a(11) =653a(12) =899a(13) =2205a(14) =3915a(15) =5715a(16) =13545a(17) =23347a(18) =36229a(19) =82923a(20) =138781a(21) =228653a(22) =506215a(23) =822381a(24) =1437267a(25) =3082029a(26) =4856667a(27) =9000947a(28) =18714281a(29) =28578195
External references
- oeis: A218138