Find out the law of 1,3,6,10,15,21,28,36 and the law of 0,1,3,6,10,15,21

1,3,6,10,15,21,28,36
The nth number of the rule is equal to adding 1 to n
1=1
3=1+2
6=1+2+3
10=1+2+3+4
……
X=（N+1)*N/2
0,1,3,6,10,15,21
The nth number of the rule is equal to the number from 0 to n-1
0=0（N-1=0)
1=0+1(N-1=1)
3=0+1+2(N-1=2)
6=0+1+2+3(N-1=3)
X=(N-1)*N/2

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