(18*n^3+3*n^2-15*n)/6.
0, 1, 21, 78, 190, 375, 651, 1036, 1548, 2205, 3025, 4026, 5226, 6643, 8295, 10200
2 seqfan posts
Wed Mar 3 04:46:13 CET 2010 [seqfan] Re: A172043 and many more
Wed Mar 3 01:35:41 CET 2010 [seqfan] A172043 and many more
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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