Expansion of e.g.f. exp(x*sqrt(1+x^2)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =13a(5) =16a(6) =61a(7) =736a(8) =1849a(9) =-12032a(10) =15481a(11) =1386496a(12) =737221a(13) =-139053056a(14) =8889973a(15) =22783492096a(16) =577232881a(18) =9090479089a(20) =747609240061