1. A note on permutations with fixed pattern;Abramson;J. Combinatorial Theory,1975
2. Développements de sec x et tan x;Andre;C.R. Acad. Sci. Paris,1879
3. Computation of tangent, Euler and Bernoulli numbers;Buckholtz;M. Comp.,1967
4. Permutations with prescribed pattern;Carlitz;Math. Nachr.,1973
5. Permutations with given ups and downs;de Bruijn;Nieuw. Arch.,1970