O.g.f. satisfies: A(x) = Sum_{n>=0} n^n * x^n * A(n*x^2)^n/n! * exp(-n*x*A(n*x^2)).
A216246
O.g.f. satisfies: A(x) = Sum_{n>=0} n^n * x^n * A(n*x^2)^n/n! * exp(-n*x*A(n*x^2)).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =7a(5) =20a(6) =62a(7) =228a(8) =867a(9) =3474a(10) =14864a(11) =67101a(12) =316028a(13) =1540782a(14) =7792810a(15) =40669011a(16) =218087867a(17) =1201778736a(18) =6792071574a(19) =39309770969a(20) =232718797430
External references
- oeis: A216246