41504

Appears in sequences

• Number of rooted planar maps with 3 vertices and n faces and no isthmuses.at n=5A006420
• Numbers whose base-4 representation contains exactly four 0's and four 2's.at n=28A045061
• 3-apexes of Omega: numbers k such that Omega(k-3) < Omega(k-2)< Omega(k-1) < Omega(k) > Omega(k+1) > Omega(k+2) > Omega(k+3), where Omega(m) = the number of prime factors of m, counting multiplicity.at n=9A076760
• Numbers k such that phi(k) = tau(k)^4, where tau(k) = A000005(k).at n=7A114063
• Number of length-(n+1) 0..n arrays with new values introduced in sequential order, and with new repeated values introduced in sequential order, both starting with zero.at n=8A268320
• Triangle read by rows: T(n,k) is the number of rooted planar maps with n edges, k faces and no isthmuses, n >= 0, k = 1..n+1.at n=42A342981