Some articles on hexagonal number, number, hexagonal numbers:
... A hexagonal number is a figurate number ... The nth hexagonal number will be the number of points in a hexagon with n regularly spaced points on a side ... The formula for the nth hexagonal number The first few hexagonal numbers (sequence A000384 in OEIS) are 1, 6, 15, 28, 45, 66, 91, 120, 153, 190, 231, 276, 325, 378, 435, 496, 561, 630, 703, 780, 861, 946 ...
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