OFFSET
1,2
COMMENTS
EXAMPLE
Written as a triangle begins:
1;
2, 4;
5, 6, 9;
10,11,12,14,16,20;
21,22,23,24,25,27,30,35;
36,37,38,39,40,41,42,44,46,48,50,54,57,60,66;
67,68,69,70,71,72,73,74,75,76,77,79,81,84,86,91,94,98,105;
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Omar E. Pol, Apr 25 2012
STATUS
approved