850089443695domain: NAppears in sequencesa(n) = 2(a(n-2) - a(n-1)) + a(n-3) where a(0)=-3, a(1)=11 & a(2)=-30.at n=27A098150a(n)=3*a(n-1)-a(n-2) with a(0)=1, a(1)=3, a(2)=11.at n=28A167375