A336489 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 three lines cross.
0, 1, 2, 8, 18, 32, 50, 102, 126, 198, 286, 390, 510, 742, 878, 1130, 1414, 1770, 2166, 2778, 3186, 3858, 4594, 5342, 6146, 7342, 8294, 9662, 11134, 12710, 14390, 16582, 18226, 20518, 22946, 25662, 28530, 32270, 35250, 38862, 42650, 46614, 50754, 55990, 60730
Offset: 1
Keywords
Links
- Lars Blomberg, Table of n, a(n) for n = 1..500