Find the first five terms of the sequence whose general term is given by
` a_(n)={ {:(n^(2) -1,",if n is odd"),((n^(2) +1)/(2),",if n is even "):}`

Explanation

Given , `a_(n) = {{:(n^(2) -1 ,, "if n is odd "),((n^(2) +1)/(2) , "if n is even"):}`
`therefore a_(1) = (1)^(2) - 1 = 0`,
` a_(2) = (4 + 1)/(2) = (5)/(2)`
` a_(3) = (3)^(2) - 1 = 8`
` a_(4) = (16 +1)/(2) = (17)/(2)`
` a_(5) = 25 - 1 = 24 `