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