A336491

Consider the figure made up of a row of n adjacent congruent rectangles, with diagonals of all possible rectangles drawn; a(n) = number of interior vertices where exactly five lines cross.

0, 0, 0, 1, 2, 2, 2, 12, 26, 20, 10, 38, 74, 118, 102, 114, 126, 178, 238, 306, 382, 466, 558, 762, 774, 778, 774, 942, 1126, 1326, 1542, 1910, 2310, 2742, 2762, 3070, 3394, 3734, 4090, 4294, 4498, 4966, 5458, 6434, 6910, 7402, 7910, 8834, 9806, 10410, 11030

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