Number of rhombi on a (n X n)-grid (or geoboard).
0, 1, 6, 22, 66, 151, 312, 564, 984, 1601, 2478, 3622, 5242, 7271, 9856, 13124
2 seqfan posts
Sun Apr 24 12:00:33 CEST 2011 [seqfan] Re: Linear Recurrences T(n, k) version of A189418 rhombus count
Sun Apr 24 02:01:28 CEST 2011 [seqfan] Linear Recurrences T(n, k) version of A189418 rhombus count
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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