193621

Appears in sequences

• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 0), (-1, 1, 1), (1, 0, -1), (1, 0, 1)}.at n=10A149295
• Number of length-4 0..n arrays with no adjacent pair x,x+1 followed at any distance by x+1,x.at n=19A268458
• a(n) = Sum_{k=0..floor(n/4)} (n-3*k)!/(n-4*k)!.at n=27A357533