Octacontagon Number | Finding the nth octacontagon number ; Driver code
def octacontagonNum ( n ) : NEW_LINE INDENT return ( 78 * n * n - 76 * n ) // 2 NEW_LINE DEDENT n = 3 NEW_LINE print ( "3rd ▁ octacontagon ▁ Number ▁ is ▁ = ▁ " , octacontagonNum ( n ) ) NEW_LINE