A296998 - cp's OEIS frontend

A296998 Number of ways to place 4 points on an n X n point grid so that no point is equally distant from two other points on the same row or the same column.

n	a(n)
1	0
2	1
3	90
4	1620
5	11810
6	56613
7	206234
8	623904
9	1641654
10	3882985
11	8431280
12	17078364
13	32641102
14	59401153
15	103638420
16	174341920
17	284041304
18	449881893
19	694849380
20	1049316180
21	1552766796
22	2255936441
23	3223157762
24	4535226864
25	6292505300
26	8618661337
27	11664674406
28	15613614884

[0, 1, 90, 1620, 11810, 56613, 206234, 623904, 1641654, 3882985, 8431280, 17078364, 32641102, 59401153, 103638420, 174341920, 284041304, 449881893, 694849380, 1049316180, 1552766796, 2255936441, 3223157762, 4535226864, 6292505300, 8618661337, 11664674406, 15613614884]

cp's OEIS Frontend

A296998 Number of ways to place 4 points on an n X n point grid so that no point is equally distant from two other points on the same row or the same column.

Table of values

List of values