Alkanes are chemical compounds composing of only carbon and hydrogen atoms by single bonds.  The image above is the most simple alkane, methane.  This means that the compound contains 1 carbon atom and 4 hydrogen atoms.  The trend for the other compounds is increasing the number of carbon atoms.  Since the first one is methane with 1 carbon and 4 hydrogen, the next compound would be ethane which contains 2 carbon and 6 hydrogen.  As you gain more carbons, the number of hydrogen is 2 more. 
Here is a table of the simple alkanes:

# Carbon Name Molecular
Methane  CH4  CH4 
Ethane  C2H6  CH3CH3 
Propane  C3H8  CH3CH2CH3 
Butane  C4H10  CH3CH2CH2CH3 
Pentane  C5H12  CH3CH2CH2CH2CH3 
Hexane  C6H14  CH3(CH2)4CH3 
Heptane  C7H16  CH3(CH2)5CH3 
Octane  C8H18  CH3(CH2)6CH3 
Nonane  C9H20  CH3(CH2)7CH3 
10  Decane  C10H22  CH3(CH2)8CH3 

Here is a video:

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