3312555

Appears in sequences

• a(n) = 6*a(n-1) - a(n-2) - 2 with a(0) = 1, a(1) = 3.at n=9A011900
• a(2n) = A011900(n), a(2n+1) = A001109(n+1).at n=18A113225
• Numbers k such that k!/m! is a triangular number for some m < k-1.at n=15A227026