schroeder
A small function for calculating Schröder numbers.
usage
> const schroeder = require('schroeder')
> schroeder(2)
6
> schroeder(-1)
NaNsee also
semibran/delannoy- calculate Delannoy numberssemibran/motzkin- calculate Motzkin numberssemibran/narayana- calculate Narayana numbers