698368

Appears in sequences

• Number of walks of length n along the edges of an octahedron starting and ending at a vertex and also ( with a(0)=0 ) between two opposite vertices.at n=11A054881
• Variance of time for a random walk starting at 0 to reach one of the boundaries at +n or -n for the first time.at n=32A072819
• a(n) = Sum_{k=floor((n+1)/2)..n} J(k+1), J(k) = A001045(k).at n=19A129362
• Terms of A181666 of the form 3*k+1.at n=38A172126
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays x(i,j) with row sums sum{x(i,j), j=1..k+1} nondecreasing, and column sums sum{i*x(i,j), i=1..n+1} nondecreasing.at n=21A232886
• Number of (1+1)X(n+1) 0..3 arrays x(i,j) with row sums sum{x(i,j), j=1..n+1} nondecreasing, and column sums sum{i*x(i,j), i=1..1+1} nondecreasing.at n=6A232887