174216

Appears in sequences

• Triangle read by rows: T(n,0)=1, T(n,n)=(2*n-1)!!+1, T(n,k) = 2*(n-k) * T(n-1,k-1) + 2*(k+1)*T(n-1,k).at n=34A099755
• Number of permutations of 3 indistinguishable copies of 1..n arranged in a circle with exactly 4 local maxima.at n=3A159724
• Sum of the fourth powers of the parts in the partitions of n into two distinct parts.at n=15A294288