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Generating function of ordered odd partitions of $n$.
Let the number of ordered partitions of $n$ with odd parts be $f(n)$. Find the generating function $f(n)$ .
My try : For $n=1$ we have $f(1)=1$, for $n=2$, $f(2)=1$, for $n=3$, $f(3)=2$, for $n=4$, $...
user1137804
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bijections between sets
Let $P_n$ be the set of compositions of $n$ where each part is at least $2, Q_n$ be the set of compositions of $n$ where each part is odd, and $R_n$ be the set of compositions where each part is $1$ ...
user747916