56475

Appears in sequences

• Number of permutations in S_n avoiding the strings 123, 321 and 231.at n=13A060696
• Sum of product of odd numbers <= n and the product of even numbers <= n.at n=11A076051
• Triangle of coefficients of powers of e^2 in numerators of Sum_{k>=1} {1 / (1 + k^2*Pi^2)^n}.at n=33A085470
• Magnetic Tower of Hanoi, total number of moves, optimally solving the [RED ; NEUTRAL ; NEUTRAL] or [NEUTRAL ; NEUTRAL ; BLUE] pre-colored puzzle.at n=11A183116
• Product of first n odd numbers plus product of first n even numbers: (2n-1)!! + (2n)!!, where k!! = A006882(k).at n=5A232617