What is this pattern called 1 3 6 10 15 21 28 36 45 55 and 2 4 7 11 16 22 29 37 46 56 called?

“Its called the sequence of partial sums of the sequence of natural numbers.”

1 3 6 10 15 21 28 36 45 55

Pattern:

1+2=3

3+3=6

6+4=10

10+5=15

15+6=21

21+7=28

28+8=36

36+9=45

45+10=55

2 4 7 11 16 22 29 37 46 56

Pattern:

2+2=4

4+3=7

7+4=11

11+5=16

16+6=22

22+7=29

29+8=37

37+9=46

46+10=56