A387209 - cp's OEIS frontend

A387209 Number of convex polygons with perimeter n on the regular triangular lattice, not counting rotations and reflections as distinct.

n	a(n)
0	0
1	0
2	0
3	1
4	1
5	1
6	3
7	2
8	4
9	4
10	6
11	5
12	10
13	7
14	12
15	11
16	16
17	13
18	22
19	17
20	26
21	23
22	32
23	27
24	41
25	33
26	47
27	42
28	56
29	48
30	68
31	57
32	77
33	69
34	89
35	78
36	105
37	90
38	117
39	106
40	133
41	118
42	153
43	134
44	169
45	154
46	189
47	170
48	214
49	190
50	234
51	215
52	259
53	235
54	289
55	260
56	314
57	290
58	344
59	315
60	380

[0, 0, 0, 1, 1, 1, 3, 2, 4, 4, 6, 5, 10, 7, 12, 11, 16, 13, 22, 17, 26, 23, 32, 27, 41, 33, 47, 42, 56, 48, 68, 57, 77, 69, 89, 78, 105, 90, 117, 106, 133, 118, 153, 134, 169, 154, 189, 170, 214, 190, 234, 215, 259, 235, 289, 260, 314, 290, 344, 315, 380]

cp's OEIS Frontend

A387209 Number of convex polygons with perimeter n on the regular triangular lattice, not counting rotations and reflections as distinct.

Table of values

List of values

n	a(n)
0	0
1	0
2	0
3	1
4	1
5	1
6	3
7	2
8	4
9	4
10	6
11	5
12	10
13	7
14	12
15	11
16	16
17	13
18	22
19	17
20	26
21	23
22	32
23	27
24	41
25	33
26	47
27	42
28	56
29	48
30	68
31	57
32	77
33	69
34	89
35	78
36	105
37	90
38	117
39	106
40	133
41	118
42	153
43	134
44	169
45	154
46	189
47	170
48	214
49	190
50	234
51	215
52	259
53	235
54	289
55	260
56	314
57	290
58	344
59	315
60	380

n	a(n)
0	0
1	0
2	0
3	1
4	1
5	1
6	3
7	2
8	4
9	4
10	6
11	5
12	10
13	7
14	12
15	11
16	16
17	13
18	22
19	17
20	26
21	23
22	32
23	27
24	41
25	33
26	47
27	42
28	56
29	48
30	68
31	57
32	77
33	69
34	89
35	78
36	105
37	90
38	117
39	106
40	133
41	118
42	153
43	134
44	169
45	154
46	189
47	170
48	214
49	190
50	234
51	215
52	259
53	235
54	289
55	260
56	314
57	290
58	344
59	315
60	380

n	a(n)
0	0
1	0
2	0
3	1
4	1
5	1
6	3
7	2
8	4
9	4
10	6
11	5
12	10
13	7
14	12
15	11
16	16
17	13
18	22
19	17
20	26
21	23
22	32
23	27
24	41
25	33
26	47
27	42
28	56
29	48
30	68
31	57
32	77
33	69
34	89
35	78
36	105
37	90
38	117
39	106
40	133
41	118
42	153
43	134
44	169
45	154
46	189
47	170
48	214
49	190
50	234
51	215
52	259
53	235
54	289
55	260
56	314
57	290
58	344
59	315
60	380