We must provide a function to return a vector of elements similar to `fibon_seq()` for each of our other five numerical sequences. The full set of functions might be declared as follows:

const vector<int> *fibon_seq( int size ); const vector<int> *lucas_seq( int size ); const vector<int> *pell_seq( int size ); const vector<int> *triang_seq( int size ); const vector<int> *square_seq( int size ); const vector<int> *pent_seq( int size );

What about `fibon_elem()`? Must we also provide six separate instances of this, one for each numeric sequence? The definition of `fibon_elem()` is as follows:

bool fibon_elem( int pos, int &elem ) { const vector<int> *pseq = fibon_seq( pos ); if ( ! pseq ) { elem = 0; return ...

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