E.g.f.: exp( Sum_{n>=1} x^(2*n-1) / (n*(2*n-1)) ).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =19a(6) =79a(7) =454a(8) =2673a(9) =20789a(10) =159101a(11) =1568786a(12) =14804701a(13) =177333727a(14) =1991552627a(15) =28122135014a(16) =366398602529