Please show all work. Write down the first four terms of each sequence.

a$)\{2n{\}}_n=1^{}$

b$)\{2n1{\}}_n=0^{}$

c$)\{2n-1{\}}_n=1^{}$

d$)\{\frac{cos(in)}{n}{\}}_n=1^{}$

e$)\{2n{\}}_n=1^{}$