a(2n) = -A106328(n), a(2n+1) = A054488(n).

Terms

a(0) =0a(1) =1a(2) =-3a(3) =8a(4) =-18a(5) =47a(6) =-105a(7) =274a(8) =-612a(9) =1597a(10) =-3567a(11) =9308a(12) =-20790a(13) =54251a(14) =-121173a(15) =316198a(16) =-706248a(17) =1842937a(18) =-4116315a(19) =10741424a(20) =-23991642a(21) =62605607a(22) =-139833537a(23) =364892218a(24) =-815009580a(25) =2126747701a(26) =-4750223943a(27) =12395593988a(28) =-27686334078a(29) =72246816227