A336490 -id:A336490 - cp's OEIS frontend

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

Lars Blomberg, Jul 25 2020

nonn

Lars Blomberg, Table of n, a(n) for n = 1..500

Cf. A334701, A336490, A336491.

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.

Original entry on oeis.org

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

Offset: 1

Lars Blomberg, Jul 25 2020

nonn

Lars Blomberg, Table of n, a(n) for n = 1..500

Cf. A334701, A336489, A336490.

cp's OEIS Frontend

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.

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