Exponential generating function is (1-x^1/1!)(1-x^2/2!)(1-x^3/3!)....

A185895

Exponential generating function is (1-x^1/1!)(1-x^2/2!)(1-x^3/3!)....

Terms

    a(0) =1a(1) =-1a(2) =-1a(3) =2a(4) =3a(5) =14a(6) =-40a(7) =-43a(8) =-357a(9) =-1762a(10) =8004a(11) =13067a(12) =78540a(13) =492439a(14) =3932305a(15) =-26867293a(16) =-44643557a(17) =-363632466a(18) =-1729625764a(19) =-15939972937a(20) =-145669871232

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