520534

Appears in sequences

• Number of nonnegative integer arrays of length n+3 with new values 0 upwards introduced in order, no three adjacent elements equal, and containing the value 3.at n=7A211830
• T(n,k)=Number of nonnegative integer arrays of length n+k+1 with new values 0 upwards introduced in order, no three adjacent elements equal, and containing the value k+1.at n=43A211836