A001792*A008683.

Terms

a(0) =1a(1) =-3a(2) =-8a(3) =0a(4) =-48a(5) =112a(6) =-256a(7) =0a(8) =0a(9) =2816a(10) =-6144a(11) =0a(12) =-28672a(13) =61440a(14) =131072a(15) =0a(16) =-589824a(17) =0a(18) =-2621440a(19) =0a(20) =11534336a(21) =24117248a(22) =-50331648a(23) =0a(24) =0a(25) =452984832a(26) =0a(27) =0a(28) =-4026531840a(29) =-8321499136