381952

Appears in sequences

• a(n) = A027144(2n-1, n-2).at n=7A027149
• a(1)=4, a(2)=4, a(n) = 4*a(n-1) + 4*a(n-2).at n=8A189743
• Number of 0..n arrays x(0..3) of 4 elements without any interior element greater than both neighbors.at n=30A200887