11184813domain: NAppears in sequencesa(n) = (7 - 4*(-2)^n)/3.at n=23A083594Jacobsthal numbers A001045 incremented by 2.at n=25A153643First differences of A135351.at n=27A155980a(n) = (2*2^n+7*(-1)^n)/3.at n=24A171382a(n) = (2*4^n + 7)/3.at n=12A321358