Expansion of e.g.f.: exp(x * (1 - x)).

Terms

a(0) =1a(1) =1a(2) =-1a(3) =-5a(4) =1a(5) =41a(6) =31a(7) =-461a(8) =-895a(9) =6481a(10) =22591a(11) =-107029a(12) =-604031a(13) =1964665a(14) =17669471a(15) =-37341149a(16) =-567425279a(17) =627491489a(18) =19919950975a(19) =-2669742629a(20) =-759627879679a(21) =-652838174519