112925557953domain: NAppears in sequencesa(n) = (Fibonacci(2*n)-(-1)^n*Fibonacci(n))/2.at n=28A049602Number of (s(0), s(1), ..., s(n)) such that 0 < s(i) < 5 and |s(i) - s(i-1)| <= 1 for i = 1,2,...,n, s(0) = 2, s(n) = 4.at n=28A094292