-225280

Appears in sequences

• a(n) = -2*a(n-1) + 4*a(n-2), a(0)=1, a(1)=2.at n=12A087205
• E.g.f. A(x) satisfies: A( x*exp(x)*cosh(x) ) = x*exp(2*x).at n=7A276359