A279445 - cp's OEIS frontend

A279445 Triangle read by rows: T(n, k) is the number of ways to place k points on an n X n square grid so that no more than 2 points are on a vertical or horizontal straight line.

n	a(n)
1	1
2	1
3	1
4	4
5	6
6	4
7	1
8	1
9	9
10	36
11	78
12	90
13	45
14	6
15	1
16	16
17	120
18	528
19	1428
20	2304
21	2040
22	816
23	90
24	1
25	25
26	300
27	2200
28	10600
29	34020
30	71400
31	93000
32	67950
33	22650
34	2040
35	1
36	36
37	630
38	6900
39	51525
40	270720
41	1005720
42	2602800
43	4531950
44	4987800
45	3110940
46	888840
47	67950
48	1
49	49
50	1176
51	17934

[1, 1, 1, 4, 6, 4, 1, 1, 9, 36, 78, 90, 45, 6, 1, 16, 120, 528, 1428, 2304, 2040, 816, 90, 1, 25, 300, 2200, 10600, 34020, 71400, 93000, 67950, 22650, 2040, 1, 36, 630, 6900, 51525, 270720, 1005720, 2602800, 4531950, 4987800, 3110940, 888840, 67950, 1, 49, 1176, 17934]

cp's OEIS Frontend

A279445 Triangle read by rows: T(n, k) is the number of ways to place k points on an n X n square grid so that no more than 2 points are on a vertical or horizontal straight line.

Table of values

List of values