G.f.: sqrt( Sum_{n>=0} x^n * Product_{k=1..n} (2*k - x) / (1 - 2*k*x) ).

A231277

G.f.: sqrt( Sum_{n>=0} x^n * Product_{k=1..n} (2*k - x) / (1 - 2*k*x) ).

Terms

    a(0) =1a(1) =1a(2) =5a(3) =43a(4) =503a(5) =7395a(6) =130417a(7) =2677347a(8) =62652163a(9) =1645424927a(10) =47918249503

External references