a(n) = [(x*y)^n] Product_{k>=1} (1 - x^k - y^k)^k.

Terms

a(0) =1a(1) =0a(2) =2a(3) =-6a(4) =-14a(5) =-10a(6) =32a(7) =76a(8) =-80a(9) =-340a(10) =-200a(11) =590a(12) =2302a(13) =1890a(14) =-3470a(15) =-11468a(16) =-16254a(17) =5244a(18) =57406a(19) =109340a(20) =81396a(21) =-158664a(22) =-550388a(23) =-829558a(24) =-359856a(25) =1509570a(26) =4333256a(27) =6198660a(28) =2628406a(29) =-10133230