Find the closed formula for each of the following sequences
(a_(n))_(n)>=1
by relating them to a well known sequence. Assume the first term given is
a_(1)
. a.
-1,2,7,14,23,dots

a_(n)=
b.
-1,1,4,8,13,dots

a_(n)=
c.
1,2,5,10,17,dots

a_(n)=
d.
4,22,118,718,5038,dots

a_(n)=

Question

Find the closed formula for each of the following sequences

(a_(n))_(n)>=1

by relating them to a well known sequence. Assume the first term given is

a_(1)

. a.

-1,2,7,14,23,dots

a_(n)=

b.

-1,1,4,8,13,dots

a_(n)=

c.

1,2,5,10,17,dots

a_(n)=

d.

4,22,118,718,5038,dots

a_(n)=

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