# How to Do Sequences in GeoGebra

`GeoGebra` Instruction 1

1.
Open `Algebra View` under  `View` in  `Menu`.
2.
Type

Sequence(<Expression>, <Variable>, <Start Value>, <End Value>)

where

• `<Expression>` is the expression defining an element in the sequence (usually given as ${F}_{n}$ or ${a}_{n}$)

• `<Variable>` is the variable used in the expression (usually $n$), which is also known as the index of the element.

• `<Start Value>` is the lowest value of the index range (usually 1)

• `<End Value>` is the highest value of the index range (usually 1)

Example 1

Compute the ten first figurate numbers of

 ${F}_{n}=n\cdot \left(n+1\right)$

You type

Sequence(n*(n+1), n, 1, 10)

in `Algebra View`. `GeoGebra` gives the sequence

{2, 6, 12, 20, 30, 42, 56, 72, 90, 110}

which contains the figurate numbers you wanted to compute!