Find the dissimilar number in the given sequence:
1, 3, 12, 60, 340

The sequence follows a specific multiplication pattern where each successive term is multiplied by a consecutively increasing integer:
* $1\times 3=3$
* $3\times 4=12$
* $12\times 5=60$
* $60\times 6=360$

However, the number provided in the sequence is 340 instead of 360. Therefore, 340 is the dissimilar number.