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math.CO2012
Bessel polynomials, double factorials and context-free grammars
Shi-Mei Ma
The purpose of this paper is to show that Bessel polynomials, double factorials and Catalan triangle can be generated by using context-free grammars.
math.CO2012★ 1 cited
Some combinatorial sequences associated with context-free grammars
Shi-Mei Ma
The purpose of this paper is to show that some combinatorial sequences, such as second-order Eulerian numbers and Eulerian numbers of type , can be generated by context-free gra…