890681domain: NAppears in sequencesa(n) = Fibonacci(2*n+1) + 2*Fibonacci(2*n-1) - 2^n - [n = 0], where [b] is the Iverson bracket of b.at n=14A084086Number of squares and rectangles in the interior of the square with vertices (n,0), (0,n), (-n,0) and (0,-n) in a square (x,y)-grid.at n=33A330805