First differences of A060819(n-4)*A060819(n).

Terms

a(0) =2a(1) =-2a(2) =3a(3) =5a(4) =-2a(5) =18a(6) =-19a(7) =43a(8) =-30a(9) =62a(10) =-71a(11) =111a(12) =-82a(13) =130a(14) =-153a(15) =209a(16) =-158a(17) =222a(18) =-265a(19) =337a(20) =-258a(21) =338a(22) =-407a(23) =495a(24) =-382a(25) =478a(26) =-579a(27) =683a(28) =-530a(29) =642