A356984 - cp's OEIS frontend

A356984 Number of regions in an equilateral triangle when n internal equilateral triangles are drawn between the 3n points that divide each side into n+1 equal parts.

n	a(n)
0	1
1	4
2	13
3	28
4	49
5	70
6	109
7	148
8	181
9	244
10	301
11	334
12	433
13	508
14	565
15	676
16	769
17	811
18	973
19	1069
20	1165
21	1324
22	1453
23	1534
24	1729
25	1876
26	1957
27	2182
28	2353
29	2446
30	2701
31	2884
32	3013
33	3268
34	3454
35	3538
36	3889
37	4108
38	4261
39	4519
40	4801
41	4960
42	5293
43	5536
44	5668
45	6076
46	6349
47	6502
48	6913
49	7204
50	7405
51	7798
52	8113

[1, 4, 13, 28, 49, 70, 109, 148, 181, 244, 301, 334, 433, 508, 565, 676, 769, 811, 973, 1069, 1165, 1324, 1453, 1534, 1729, 1876, 1957, 2182, 2353, 2446, 2701, 2884, 3013, 3268, 3454, 3538, 3889, 4108, 4261, 4519, 4801, 4960, 5293, 5536, 5668, 6076, 6349, 6502, 6913, 7204, 7405, 7798, 8113]

cp's OEIS Frontend

A356984 Number of regions in an equilateral triangle when n internal equilateral triangles are drawn between the 3n points that divide each side into n+1 equal parts.

Table of values

List of values