Help me figure out this pattern

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6,556
ok ill type up the problem,

THe table below shows the relationships between the number of blocks and the height of the stack. You are given the first5 readings. Using the patter, give the number of blocks for a stack that is 10 high? for n high?

Height..... Number of blocks
1.............1
2..............3
3..............6
4...............10
5..............15
6..............21
7.............28
8.................36

ok i added some others one in there. i can figure it out for 10 high because it adds 2 than 3 than 4 and so on. but i have to find a formula for it to fine n high. in otherwards, whats the direct relationship for them im stumped:confused:

EDIT:
i figured out there all triangluar numbers, i think im close to solving it :p

EDIT2:
i got it here is the forumula for you guys who are curious, i used wiki and it was right :p
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