60958

Appears in sequences

• "Half-Catalan numbers": a(n) = Sum_{k=1..floor(n/2)} a(k)*a(n-k) with a(1) = 1.at n=17A000992
• Number of terms in a skew determinant: a(n) = (A000085(n) + A081919(n))/2.at n=8A002771
• Number of (n+1)X(2+1) 0..2 arrays with the upper median of every 2X2 subblock equal.at n=2A237302
• Number of (n+1) X (3+1) 0..2 arrays with the upper median of every 2 X 2 subblock equal.at n=1A237303
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the upper median of every 2X2 subblock equal.at n=7A237308
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with the upper median of every 2X2 subblock equal.at n=8A237308