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Calculate Delannoy numbers
semibran
A small function for calculating Delannoy numbers.
> const delannoy = require('delannoy')
> delannoy(3, 3)
63kchapelier/von-neumann - find the number of cells in an m-dimensional von Neumann neighborhood of range nsemibran/motzkin - calculate Motzkin numberssemibran/narayana - calculate Narayana numbers