how many ways can you write a number n as a sum of 1s, 2s and 3s
95409
Find no. of non negative integer solutions of $a+2b+3c = 200$
59612
Proof by induction that if $n \in \mathbb N$ then it can be written as sum of different Fibonacci numbers
149010
Finding Combinations to the provided Sum value
83481
How to write 1, 2, ... as a subscript to a letter?
7073
How to get to the formula for the sum of squares of first n numbers?
155496
sum of combinations $\binom n{0} + \binom n{3} + \binom n{6} +... +\binom n{3k}$
140433
The number of ways of writing an integer as a sum of two squares
130542
Every natural number $n$ can be written as $n=s-t$ with $\omega(s)=\omega(t)$
31485
Three negative and three positive $1$s in a serie
32508
how many ways can the letters in ARRANGEMENT can be arranged
98313
Number of possible permutations of n1 1's, n2 2's, n3 3's, n4 4's such that no two adjacent elements are same?
140416
Catalan number - combinatoric
157280
How do I sum up specific things in Numbers?
145255
Fibonacci, tribonacci and other similar sequences
146746
A formula for the sum of the triangular numbers?
39199
closed form for $\binom{n}{0}+\binom{n}{3}+\binom{n}{6}+...+\binom{n}{n}$
44577
Finding a formula to sum natural numbers up to $n$