204668310

Appears in sequences

• a(n) = 2*Fibonacci(2*n+2).at n=19A025169
• A Chebyshev transform of (1+3x)/(1-3x).at n=19A099858
• Number of permutations avoiding the patterns {1432,2431,3412,3421,4132,4231,4312,4321}; number of strong sorting class based on 1432.at n=20A111282
• First differences of A137976 after having added two leading ones.at n=16A138298
• Number of n X 2 binary arrays with all 1s connected, a path of 1s from top row to bottom row, and no 1 having more than two 1s adjacent.at n=37A163714