Even triangular numbers halved.
0, 3, 5, 14, 18, 33, 39, 60, 68, 95, 105, 138, 150, 189, 203, 248, 264, 315, 333, 390
2 seqfan posts
Fri Feb 20 17:56:41 CET 2009 [seqfan] Re: the comments
Thu Feb 19 21:51:45 CET 2009 [seqfan] the comments
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
Links to OEIS content are included according to
The OEIS End-User License Agreement
.