a(n) = A242107(n+1) * A242107(n-1) * (1 + mod(n,2)).

Terms

a(0) =1a(1) =0a(2) =1a(3) =2a(4) =-1a(5) =4a(6) =3a(7) =4a(8) =15a(9) =-14a(10) =65a(11) =224a(12) =-143a(13) =1824a(14) =1441a(15) =12882a(16) =50959a(17) =-151420a(18) =898979a(19) =5337220a(20) =20799a(21) =188372002a(22) =-733599a(23) =6648401344a(24) =39471457217a(25) =-234341035456