A239438 - cp's OEIS frontend

A239438 Maximal number of points that can be placed on a triangular grid of side n so that there is no pair of adjacent points.

n	a(n)
1	1
2	1
3	3
4	4
5	6
6	7
7	10
8	12
9	15
10	19
11	22
12	26
13	31
14	35
15	40
16	46
17	51
18	57
19	64
20	70
21	77
22	85
23	92
24	100
25	109
26	117
27	126
28	136
29	145
30	155
31	166
32	176
33	187
34	199
35	210
36	222
37	235
38	247
39	260
40	274
41	287
42	301
43	316
44	330
45	345
46	361
47	376
48	392
49	409

[1, 1, 3, 4, 6, 7, 10, 12, 15, 19, 22, 26, 31, 35, 40, 46, 51, 57, 64, 70, 77, 85, 92, 100, 109, 117, 126, 136, 145, 155, 166, 176, 187, 199, 210, 222, 235, 247, 260, 274, 287, 301, 316, 330, 345, 361, 376, 392, 409]

cp's OEIS Frontend

A239438 Maximal number of points that can be placed on a triangular grid of side n so that there is no pair of adjacent points.

Table of values

List of values

n	a(n)
1	1
2	1
3	3
4	4
5	6
6	7
7	10
8	12
9	15
10	19
11	22
12	26
13	31
14	35
15	40
16	46
17	51
18	57
19	64
20	70
21	77
22	85
23	92
24	100
25	109
26	117
27	126
28	136
29	145
30	155
31	166
32	176
33	187
34	199
35	210
36	222
37	235
38	247
39	260
40	274
41	287
42	301
43	316
44	330
45	345
46	361
47	376
48	392
49	409

n	a(n)
1	1
2	1
3	3
4	4
5	6
6	7
7	10
8	12
9	15
10	19
11	22
12	26
13	31
14	35
15	40
16	46
17	51
18	57
19	64
20	70
21	77
22	85
23	92
24	100
25	109
26	117
27	126
28	136
29	145
30	155
31	166
32	176
33	187
34	199
35	210
36	222
37	235
38	247
39	260
40	274
41	287
42	301
43	316
44	330
45	345
46	361
47	376
48	392
49	409

n	a(n)
1	1
2	1
3	3
4	4
5	6
6	7
7	10
8	12
9	15
10	19
11	22
12	26
13	31
14	35
15	40
16	46
17	51
18	57
19	64
20	70
21	77
22	85
23	92
24	100
25	109
26	117
27	126
28	136
29	145
30	155
31	166
32	176
33	187
34	199
35	210
36	222
37	235
38	247
39	260
40	274
41	287
42	301
43	316
44	330
45	345
46	361
47	376
48	392
49	409