4180992

Appears in sequences

• 1 + Sum_{n >= 1} Sum_{k = 0..n-1} (-1)^n*T(n,k)*y^(2*k)*x^(2*n)/(2*n)! = JacobiCN(x,y).at n=26A060627
• Half the number of permutations of 0..n with exactly two maxima.at n=12A100575
• Fibonacci 11-step numbers.at n=33A168082
• Number of compositions (ordered partitions) of n into parts not greater than n/2.at n=23A368484