Floyd's triangle   lists the natural numbers in a right triangle aligned to the left where

 the first row is   1     (unity)
 successive rows start towards the left with the next number followed by successive naturals listing one more number than the line above.


The first few lines of a Floyd triangle looks like this:

 1
 2  3
 4  5  6
 7  8  9 10
11 12 13 14 15



Task

 Write a program to generate and display here the first   n   lines of a Floyd triangle. 
(Use   n=5   and   n=14   rows).
 Ensure that when displayed in a mono-space font, the numbers line up in vertical columns as shown and that only one space separates numbers of the last row.


 
floyd:{n:1+ til sum 1+til x;
       t:d:0;
       while[1+x-:1;0N!(t+:1)#(d+:t)_n]}
 
floyd2:{n:1+ til sum 1+til x;
        t:d:0;
        while[1+x-:1;1 (" " sv string each (t+:1)#(d+:t)_n),"\n"]}
 
//The latter function 'floyd2' includes logic to remove the leading "," before "1" in the first row.
 
floyd[5]
floyd2[14]