A291717 - cp's OEIS frontend

A291717 Triangle T(m,k) read by rows, where T(m,k) is the number of ways in which 1 <= k <= m positions can be picked in an m X m square grid such that the picked positions have a central symmetry.

n	a(n)
1	1
2	4
3	6
4	9
5	36
6	8
7	16
8	120
9	24
10	168
11	25
12	300
13	72
14	714
15	178
16	36
17	630
18	144
19	2273
20	464
21	6576
22	49
23	1176
24	288
25	5932
26	1476
27	24288
28	6404
29	64
30	2016
31	480
32	13536
33	3040
34	74560
35	15680
36	341320
37	81
38	3240
39	800
40	27860
41	6940
42	197600
43	50860
44	1170466
45	314862

[1, 4, 6, 9, 36, 8, 16, 120, 24, 168, 25, 300, 72, 714, 178, 36, 630, 144, 2273, 464, 6576, 49, 1176, 288, 5932, 1476, 24288, 6404, 64, 2016, 480, 13536, 3040, 74560, 15680, 341320, 81, 3240, 800, 27860, 6940, 197600, 50860, 1170466, 314862]

cp's OEIS Frontend

A291717 Triangle T(m,k) read by rows, where T(m,k) is the number of ways in which 1 <= k <= m positions can be picked in an m X m square grid such that the picked positions have a central symmetry.

Table of values

List of values