Top network posts

• 7 How many times do you have to use L'Hôpital's rule?
• 6 A bijection between Motzkin paths and 3-colored signed Dyck path homomorphs
• 6 Is the numerator of $\sum_{k=0}^{n}{(-1)^k\binom{n}{k}\frac{1}{2k+1}}$ always a power of $2$ in lowest terms?
• 6 Generating function
• 6 Simple proof that $\lfloor \log_2 k \rfloor + 1 = \lceil \log_2 (k + 1) \rceil$
• 5 Fibonacci numbers as weighted averages of powers of 5 -- a bijective/combinatorial proof?
• 5 A combinatorial interpretation for $n$-ary trees for negative $n$
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