Online proportional series item generator
Generate a list of all items of the proportional sequence according to the rules. If a sequence starts from item 2 and the ratio of each item to its previous item is equal to the same constant, the sequence is called an equal ratio sequence. This constant is called the common ratio of the isometric sequence. The common ratio is usually represented by the letter Q (Q ≠ 0), and the isometric sequence A1 ≠ 0. Note: when q = 1, an is a constant column.