57255

Appears in sequences

• Powers of rooted tree enumerator.at n=29A000439
• Sum of even products minus sum of odd products of different pairs of numbers from 1 to n.at n=29A134449
• Number of nX4 0,1 arrays with the row and column sums nondecreasing.at n=5A202556
• Number of nX6 0,1 arrays with the row and column sums nondecreasing.at n=3A202558
• T(n,k)=Number of nXk 0,1 arrays with the row and column sums nondecreasing.at n=39A202560
• T(n,k)=Number of nXk 0,1 arrays with the row and column sums nondecreasing.at n=41A202560
• a(n) is the number of 2-point antichains in the poset D_{2n+1} of type D, whose elements are compositions of 2n+1.at n=28A344791
• a(n) = Sum_{k=0..floor(n/2)} (-1)^k * (n-k)!/(n-2*k)!.at n=19A358603