a(n) = [x^n] (1/(1 - x - x^2/(1 - 2*x - 2*x^2/(1 - 3*x - 3*x^2/(1 - 4*x - 4*x^2/(1 - ...))))))^n.
A292871
a(n) = [x^n] (1/(1 - x - x^2/(1 - 2*x - 2*x^2/(1 - 3*x - 3*x^2/(1 - 4*x - 4*x^2/(1 - ...))))))^n.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =28a(4) =169a(5) =1071a(6) =7034a(7) =47538a(8) =329249a(9) =2331424a(10) =16856915a(11) =124387286a(12) =936799582a(13) =7204759238a(14) =56634639780a(15) =455560907508
External references
- oeis: A292871