349867

Appears in sequences

• Number of rational knots (or two-bridge knots) with n crossings (up to mirroring).at n=20A018240
• Duplicate of A018240.at n=20A090596
• a(n) = 3*n^4 + 6*n^3 - 3*n + 1.at n=18A181475
• a(n) = (1^n + (-2)^n + 4^n)/3.at n=10A245489