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

Terms

a(0) =1a(1) =0a(2) =2a(3) =6a(4) =12a(5) =120a(6) =480a(7) =2520a(8) =21840a(9) =120960a(10) =937440a(11) =8316000a(12) =60540480a(13) =570810240a(14) =5465940480a(15) =49037788800a(16) =523588665600