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

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =7a(5) =31a(6) =91a(7) =211a(8) =1681a(9) =25537a(10) =192361a(11) =949081a(12) =4830871a(13) =85109311a(14) =951416467a(15) =6696998491a(16) =119863554721