405810405

Appears in sequences

• Denominator of Sum_{k=1..n} 1/(2*k-1)^2.at n=7A128492
• Square array read by upward antidiagonals: T(n, k) = denominator( 2*k!*(-2)^k*Sum_{m=1..n}( 1/(2*m-1)^(k+1) ) ).at n=15A370691