1. Permutations related to secant, tangent, and eulerian numbers;Abramson;Canad. Math. Bull.,1979
2. Développement de secx+tanx;André;C. R. Acad. Sci. Paris,1879
3. The theory of partitions;Andrews,1998
4. Divisibility properties of the q-tangent numbers;Andrews;Proc. Amer. Math. Soc.,1978
5. Enumeration of up–down permutations by number of rises;Carlitz;Pacific J. Math.,1973