Convolution square of A285349.

Terms

a(0) =1a(1) =-4a(2) =12a(3) =-24a(4) =36a(5) =-36a(6) =8a(7) =56a(8) =-148a(9) =228a(10) =-228a(11) =80a(12) =248a(13) =-688a(14) =1048a(15) =-1048a(16) =420a(17) =896a(18) =-2588a(19) =3920a(20) =-3884a(21) =1648a(22) =2864a(23) =-8488a(24) =12744a(25) =-12516a(26) =5440a(27) =8400a(28) =-25176a(29) =37480