Its a Discrete Math Problem. Please give me this questions answer.

Consider the sequence an, n 21: 1, 2,4, 7, 11, 16, 22, 29, 37, we may use to guess a10? Find a2 and a7. Is there a pattern Find the first five terms of the following sequences. Do you observe any pattern? 1. bn (-1)", n 21. n(n+1) 1 ,n1 n21 3. dn is the sum of the first n odd positive numbers. For example, di : l, d2 #: 1 + 3 4,d,-1+345-9, etc