141840

Appears in sequences

• Doubles (index 2+) under "AIJ" (ordered, indistinct, labeled) transform.at n=5A032037
• Triangle read by rows: T(n, k) = n! * 2^k * hypergeom([-k], [-n], -1/2).at n=38A374427
• Number of Hamiltonian paths in the n-flower graph.at n=8A387456