What is the law of the calculation of 1 + 3 + 6 + 10 + 15 + 21 + 28?

The difference between each two items is an arithmetic sequence with a tolerance of 1
For example, 3-1 = 26-3 = 310-6 = 415-10 = 521-15 = 6
28-21 = 7, the next term of 28 is 36
At the same time, we can see that 1 + 3 = 4 = 2 * 26 + 10 = 16 = 4 * 4
21+15＝36＝6*6 28+36＝64＝8*8

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