Evolve to the next triangle numberblock, or the next numberblock that's a member of the step squad. Starts out with 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 105, 120, 136, 153, and so forth.
![Triangular Numberblock Evolution [ 351 to 378 ]](https://cdn2.scratch.mit.edu/get_image/project/465957442_480x360.png)
