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Maths please help u thingy

Maths please help u thingy-example-1

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\begin{array}{cll} term&\stackrel{u_n+u_(n-1)+1}{value}\\ \cline{1-2} u_1&1\\ u_2&3\\ u_3&\stackrel{u_n}{3}+\stackrel{u_(n-1)}{1}+1\\ &5\\ u_4&\stackrel{u_n}{5}+\stackrel{u_(n-1)}{3}+1\\ &9\\ u_5&\stackrel{u_n}{9}+\stackrel{u_(n-1)}{5}+1\\ &15 \end{array}

in recursive sequence notation, is another way of saying
"the next term will be the current one plus the one before it, plus one"

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