A092275 - cp's OEIS frontend

A092275 Draw a line through every pair of points with coordinates (x, 1) and (x', 2) with x, x' in 1..n, and then count the number of intersection points above the line y = 2.

n	a(n)
2	0
3	2
4	11
5	29
6	69
7	125
8	224
9	361
10	563
11	809
12	1164
13	1597
14	2188
15	2871
16	3714
17	4701
18	5956
19	7359
20	9099
21	11067
22	13365
23	15879
24	18884
25	22201
26	26056
27	30219
28	34951
29	40117
30	46073
31	52441
32	59716
33	67599
34	76320
35	85569
36	95790
37	106701
38	118902

[0, 2, 11, 29, 69, 125, 224, 361, 563, 809, 1164, 1597, 2188, 2871, 3714, 4701, 5956, 7359, 9099, 11067, 13365, 15879, 18884, 22201, 26056, 30219, 34951, 40117, 46073, 52441, 59716, 67599, 76320, 85569, 95790, 106701, 118902]

cp's OEIS Frontend

A092275 Draw a line through every pair of points with coordinates (x, 1) and (x', 2) with x, x' in 1..n, and then count the number of intersection points above the line y = 2.

Table of values

List of values