242792
domain: N
Appears in sequences
- a(n) = C(n+2, 2) + C(n+2, 3) + C(n+2, 4) + C(n+2, 5).at n=30A027660
- Number of nonempty subsets of {1,2,...,n} in which exactly 3/4 of the elements are <= n/3.at n=34A047197
- Number of nonempty subsets of {1,2,...,n} in which exactly 3/4 of the elements are <= (n-1)/3.at n=34A048009
- Number of nonempty subsets of {1,2,...,n} in which exactly 3/4 of the elements are <= (n-2)/3.at n=34A048020
- A014486-encodings of trivalent plane trees (tpt) represented as (embedded into) a subset of general plane trees.at n=16A083936
- n_F(n) where F() = Fibonacci numbers A000045.at n=25A122629
- Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly three ways, and new values 0..1 introduced in row major order.at n=22A204746
- Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 81", based on the 5-celled von Neumann neighborhood.at n=8A270099