1,6,20,56,....

That's

1×1, 2×3, 4×5, 8×7, 16*9, ...

an = 2n-1(2n-1)

Edwin

I need the answer for question (i) and (ii) both of them please:

(2) Let... (answered by Edwin McCravy,AnlytcPhil,ikleyn)

A sequence {mn} is recursively defined as 
m1=2,... (answered by Edwin McCravy)

The sequences are defined using recursion formulas.  Write the first four terms of each... (answered by Edwin McCravy)

Find the first six terms of the sequence. 

a1 = -3, an =... (answered by Edwin McCravy)

Consider a sequence 4, x, 9, ... with x>0
If the sequence is geometic, find (a) the... (answered by stanbon)

Idk if this is trig or not but...

if a sub 1 = 8 

and a sub n = a sub (n-1)/2... (answered by Fombitz)

Define the a3 and a4 terms of the recurrence relation:... (answered by Edwin McCravy)

Find an for the arithmetic series
with S16 = -288, and... (answered by greenestamps,Edwin McCravy)