Secant Number

Author

Eric W. Weisstein
January 14, 2004

This notebook downloaded from http://mathworld.wolfram.com/notebooks/IntegerSequences/SecantNumber.nb.

For more information, see Eric's MathWorld entry http://mathworld.wolfram.com/SecantNumber.html.

©2005 Wolfram Research, Inc. except for portions noted otherwise

Series

Series[Sec[x],{x,0,10}]

Sum[(((((-1))^k)EulerE[2k] (x^k))/((2k)!)),{k,0,5}]