4-dimensional pyramidal numbers: n^2*(n^2-1)/12.
0, 0, 1, 6, 20, 50, 105, 196, 336, 540, 825, 1210, 1716, 2366, 3185, 4200, 5440, 6936
2 seqfan posts
Sat Mar 7 11:54:06 CET 2009 [seqfan] Re: Squares in a grid
Sat Mar 7 09:12:09 CET 2009 [seqfan] Squares in a grid
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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