References to A055999

a(n)=n*(n+7)/2.
0, 4, 9, 15, 22, 30, 39, 49, 60, 72, 85, 99, 114, 130, 147, 165, 184, 204, 225, 247, 270

1 seqfan posts

Fri Mar 12 10:09:44 CET 2010    [seqfan] editing A000217 Triangular numbers (long message)
Index of A-numbers in seqfan: by ascending order    by month    by frequency    by keyword
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