-1398099

Appears in sequences

• a(n) = (7 - 4*(-2)^n)/3.at n=20A083594
• A generalized Jacobsthal sequence.at n=21A083944
• a(0)=a(1)=1, a(n) = 2*a(n-1)- A010686(n), n>1.at n=21A173114