4108329225

Appears in sequences

• a(n) is the least common multiple of {1, 5, 9, 13, 17, ..., 4n+1} (A016813).at n=9A051539
• a(n) = (4*n+9)(!^4)/9(!^4), related to A007696(n+1) ((4*n+1)(!^4) quartic, or 4-factorials).at n=7A051621
• Denominator of 1 + 1/5 + 1/9 +...+ 1/(4n+1).at n=9A097328
• Minimal number of times a rectangular grid of n X n+1 elements can be slid along a 45-degree line before a rotated version of the initial grid appears.at n=19A110026