OFFSET
1,3
COMMENTS
EXAMPLE
Triangle begins:
.1;
.1, 2;
.2, 3, 4;
.3, 4, 5, 6;
.6, 7, 8, 9,10;
.7, 8, 9,10,11,12;
10,11,12,13,14,15,16;
11,12,13,14,15,16,17,18;
14,15,16,17,18,19,20,21,22;
19,20,21,22,23,24,25,26,27,28;
20,21,22,23,24,25,26,27,28,29,30;
CROSSREFS
KEYWORD
AUTHOR
Omar E. Pol, Jul 10 2009
STATUS
approved