G.f. satisfies x = Sum_{n>=1} -(-1)^(n mod 3) * x^n * abs(1/A(x)^n), where abs(F(x)) equals the series expansion formed by the unsigned coefficients in F(x).
A381354
G.f. satisfies x = Sum_{n>=1} -(-1)^(n mod 3) * x^n * abs(1/A(x)^n), where abs(F(x)) equals the series expansion formed by the unsigned coefficients in F(x).
Terms
- a(0) =1a(1) =1a(2) =4a(3) =14a(4) =44a(5) =130a(6) =496a(7) =1586a(8) =5128a(9) =17764a(10) =59492a(11) =196368a(12) =659330a(13) =2226166a(14) =7396070a(15) =24876724a(16) =83420692a(17) =279644938a(18) =935867180a(19) =3146178556a(20) =10534161782a(21) =35369902036a(22) =118498115768a(23) =398015733448
External references
- oeis: A381354