a(n) = denominator(n!*[z^n](z*(exp(z)+2*exp(-(1/2)*z)*cos((1/2)*z* 3^(1/2)))/(1-exp(-z)))).

Terms

a(0) =1a(1) =2a(2) =2a(3) =1a(4) =10a(5) =1a(6) =14a(7) =1a(8) =10a(9) =1a(10) =22a(11) =1a(12) =910a(13) =1a(14) =10a(15) =1a(16) =170a(17) =1a(18) =1330a(19) =1a(20) =110a(21) =1a(22) =230a(23) =1a(24) =910a(25) =1a(26) =2a(27) =1a(28) =290a(29) =1