G.f. A(x) satisfies: A(x) = 1 + x + x^2 + x^3 + x^4 * A(x/(1 - 2*x)) / (1 - 2*x).
A351343
G.f. A(x) satisfies: A(x) = 1 + x + x^2 + x^3 + x^4 * A(x/(1 - 2*x)) / (1 - 2*x).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =9a(7) =27a(8) =81a(9) =245a(10) =761a(11) =2493a(12) =8849a(13) =34519a(14) =147057a(15) =670327a(16) =3198561a(17) =15732905a(18) =79174929a(19) =407127897a(20) =2145061729a(21) =11635963499a(22) =65309080185a(23) =380583443187
External references
- oeis: A351343