A234247 - cp's OEIS frontend

A234247 Triangle T(n,k) read by rows: Number of non-equivalent ways (mod D_3) to choose k points from an nXnXn triangular grid so that no three of them form a 2X2X2 subtriangle.

n	a(n)
1	1
2	1
3	1
4	2
5	4
6	4
7	2
8	3
9	10
10	22
11	31
12	22
13	10
14	1
15	4
16	22
17	82
18	212
19	374
20	450
21	342
22	156
23	36
24	2
25	5
26	41
27	231
28	955
29	2880
30	6459
31	10660
32	12948
33	11274
34	6802
35	2645
36	595
37	57
38	2
39	7
40	72
41	566
42	3335
43	14883
44	51470
45	139224
46	297048
47	500147
48	661796
49	681101
50	536322
51	314753
52	132490

[1, 1, 1, 2, 4, 4, 2, 3, 10, 22, 31, 22, 10, 1, 4, 22, 82, 212, 374, 450, 342, 156, 36, 2, 5, 41, 231, 955, 2880, 6459, 10660, 12948, 11274, 6802, 2645, 595, 57, 2, 7, 72, 566, 3335, 14883, 51470, 139224, 297048, 500147, 661796, 681101, 536322, 314753, 132490]

cp's OEIS Frontend

A234247 Triangle T(n,k) read by rows: Number of non-equivalent ways (mod D_3) to choose k points from an nXnXn triangular grid so that no three of them form a 2X2X2 subtriangle.

Table of values

List of values