155144

Appears in sequences

• a(n) = floor(n*(n-1)*(n-2)*(n-3)/21).at n=44A011931
• Number of length n+5 0..3 arrays with at most two downsteps in every 5 consecutive neighbor pairs.at n=3A255657
• T(n,k)=Number of length n+k 0..3 arrays with at most two downsteps in every k consecutive neighbor pairs.at n=31A255660
• Number of length n+4 0..3 arrays with at most two downsteps in every n consecutive neighbor pairs.at n=4A255664