Diagonal of A129819.

Terms

a(0) =0a(1) =0a(2) =1a(3) =-2a(4) =5a(5) =-11a(6) =23a(7) =-48a(8) =102a(9) =-220a(10) =476a(11) =-1024a(12) =2184a(13) =-4624a(14) =9744a(15) =-20480a(16) =42976a(17) =-90048a(18) =188352a(19) =-393216a(20) =819328a(21) =-1704192a(22) =3539200a(23) =-7340032a(24) =15203840a(25) =-31456256a(26) =65010688a(27) =-134217728a(28) =276826112a(29) =-570429440