A331911 - cp's OEIS frontend

A331911 Triangle read by rows: Take an equilateral triangle with all diagonals drawn, as in A092867. Then T(n,k) = number of k-sided polygons in that figure for k = 3, 4, ..., n+2 and where n is the number of equal parts each side is divided into.

n	a(n)
1	1
2	12
3	0
4	48
5	24
6	3
7	162
8	90
9	0
10	0
11	378
12	306
13	15
14	16
15	0
16	774
17	696
18	84
19	18
20	0
21	0
22	1470
23	1383
24	219
25	37
26	0
27	0
28	0
29	2604
30	2382
31	600
32	78
33	6
34	6
35	0
36	0
37	4224
38	4089
39	771
40	177
41	24
42	6
43	0
44	0
45	0
46	6624
47	6186
48	1470
49	234
50	42
51	0
52	0
53	0
54	0
55	0
56	9738
57	9486
58	2307
59	498
60	48
61	0
62	0
63	3
64	0
65	1
66	0
67	14010
68	13548
69	3984
70	816
71	144
72	0
73	0
74	0
75	0
76	0
77	0
78	0

[1, 12, 0, 48, 24, 3, 162, 90, 0, 0, 378, 306, 15, 16, 0, 774, 696, 84, 18, 0, 0, 1470, 1383, 219, 37, 0, 0, 0, 2604, 2382, 600, 78, 6, 6, 0, 0, 4224, 4089, 771, 177, 24, 6, 0, 0, 0, 6624, 6186, 1470, 234, 42, 0, 0, 0, 0, 0, 9738, 9486, 2307, 498, 48, 0, 0, 3, 0, 1, 0, 14010, 13548, 3984, 816, 144, 0, 0, 0, 0, 0, 0, 0]

cp's OEIS Frontend

A331911 Triangle read by rows: Take an equilateral triangle with all diagonals drawn, as in A092867. Then T(n,k) = number of k-sided polygons in that figure for k = 3, 4, ..., n+2 and where n is the number of equal parts each side is divided into.

Table of values

List of values