a(n) = (-1)^n*n!*[x^n] exp(-3*x)/(1 - 2*x).

A343582

a(n) = (-1)^n*n!*[x^n] exp(-3*x)/(1 - 2*x).

Terms

    a(0) =1a(1) =1a(2) =5a(3) =-3a(4) =105a(5) =-807a(6) =10413a(7) =-143595a(8) =2304081a(9) =-41453775a(10) =829134549a(11) =-18240782931a(12) =437779321785

External references