G.f. A(x) satisfies: A(x) = x + x^2 * exp(3 * Sum_{k>=1} (-1)^(k+1) * A(x^k) / k).
A345244
G.f. A(x) satisfies: A(x) = x + x^2 * exp(3 * Sum_{k>=1} (-1)^(k+1) * A(x^k) / k).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =6a(4) =19a(5) =57a(6) =177a(7) =586a(8) =1950a(9) =6642a(10) =22990a(11) =80400a(12) =284346a(13) =1014237a(14) =3644841a(15) =13185810a(16) =47976382a(17) =175458798a(18) =644630064a(19) =2378084209a(20) =8805524949a(21) =32714828733a(22) =121917589291a(23) =455625246297
External references
- oeis: A345244