Triangular Arrays using context-free grammar

Voalaza Mahavily Romuald Aubert, Benjamin Randrianirina

In this work, the Hao grammar $G=\{u\to u^{b_1+b_2+1}{v}^{a_1+a_2},v\to u^{b_2}{v}^{a_2+1}\},$ together with the correspondence between grammars and combin…