Numerator of Euler(n, 2/7).

Terms

a(0) =1a(1) =-3a(2) =-10a(3) =207a(4) =590a(5) =-10443a(6) =-87730a(7) =8725719a(8) =24386030a(9) =-779929533a(10) =-10896056050a(11) =851890629837