Write the first 5 terms of the sequences defined by
`T_n = 2n^2 - 1`

Write the first three terms of the sequence defined by the following : a_n =n(n+2) .

Write the first three terms in the sequences defined by the following : a_n =2n + 5 .

Write the first three terms in the sequences defined by the following : a_n =(n-3)/4 .

What is the 20th term of the sequence defined by : a_n = (n- 1) (2-n)(3+n) ?

Find the 21st and 42nd terms of the sequence defined by : t_n= {(0,if n is odd),(1, if n is even):} .

Find the 18th and 25th terms of the sequence defined by : t_n= {(n(n+2),if n is even natural number),((4n)/(n^2+1), if n is odd natural number):} .

Write the first five terms of the sequences given below and obtain the corresponding series: a_1=a_2 =2, a_n=a_(n-1)-1 , n>2

Write the first five terms of the sequences given below and obtain the corresponding series: a_1=-1 , a_n= (a_(n-1))/n , n ge2

Write the first five terms of the sequences given below and obtain the corresponding series: a_1=3 , a_n= 3a_(n-1)+2 forall n > 1