Central numbers in triangle A103728.

Terms

a(0) =-1a(1) =5a(2) =-17a(3) =-229a(4) =853a(5) =12113a(6) =-46061a(7) =-674761a(8) =38733269a(9) =-150113729a(10) =8829861373a(11) =134484418361a(12) =-525740249453