161889

Appears in sequences

• Number of perfect matchings on n+3 edges which represent RNA secondary folding structures characterized by the Reeder and Giegerich and the Lyngso and Pedersen families, but not the family characterized by Cao and Chen.at n=8A289031
• Expansion of (1/x) * Series_Reversion( x / (1 + x^3 / (1 - x)^3) ).at n=15A389250