4 times triangular numbers: 2*n*(n+1).
0, 4, 12, 24, 40, 60, 84, 112, 144, 180, 220, 264, 312, 364, 420, 480, 544, 612, 684
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
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