A336491 - cp's OEIS frontend

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.

n	a(n)
1	0
2	0
3	0
4	1
5	2
6	2
7	2
8	12
9	26
10	20
11	10
12	38
13	74
14	118
15	102
16	114
17	126
18	178
19	238
20	306
21	382
22	466
23	558
24	762
25	774
26	778
27	774
28	942
29	1126
30	1326
31	1542
32	1910
33	2310
34	2742
35	2762
36	3070
37	3394
38	3734
39	4090
40	4294
41	4498
42	4966
43	5458
44	6434
45	6910
46	7402
47	7910
48	8834
49	9806
50	10410
51	11030

[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]

cp's OEIS Frontend

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.

Table of values

List of values