2228088

Appears in sequences

• a(n) = n * (2^n - 8).at n=17A083727
• Number of unordered pairs of 4-colorings of an n-wheel that differ in the coloring of exactly one vertex.at n=15A309379
• Number of ways we can write [n] as the union of 2 sets of sizes i, j which intersect in exactly 2 elements (2 < i,j < n; i = j allowed).at n=13A348257