A231655 - cp's OEIS frontend

A231655 Triangle T(n, k) read by rows giving number of non-equivalent ways to choose k points in an equilateral triangle grid of side n.

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	2
8	4
9	6
10	4
11	2
12	1
13	1
14	3
15	10
16	25
17	41
18	48
19	41
20	25
21	10
22	3
23	1
24	1
25	4
26	22
27	87
28	244
29	526
30	870
31	1110
32	1110
33	870
34	526
35	244
36	87
37	22
38	4
39	1
40	1
41	5
42	41
43	238
44	1029
45	3450
46	9147
47	19524
48	34104
49	49231
50	59038
51	59038
52	49231
53	34104
54	19524
55	9147
56	3450
57	1029
58	238

[1, 1, 1, 1, 1, 1, 1, 2, 4, 6, 4, 2, 1, 1, 3, 10, 25, 41, 48, 41, 25, 10, 3, 1, 1, 4, 22, 87, 244, 526, 870, 1110, 1110, 870, 526, 244, 87, 22, 4, 1, 1, 5, 41, 238, 1029, 3450, 9147, 19524, 34104, 49231, 59038, 59038, 49231, 34104, 19524, 9147, 3450, 1029, 238]

cp's OEIS Frontend

A231655 Triangle T(n, k) read by rows giving number of non-equivalent ways to choose k points in an equilateral triangle grid of side n.

Table of values

List of values