A269064 - cp's OEIS frontend

A269064 At stage 1, start with a unit equilateral triangle. At each successive stage add 3*(n-1) new triangles around outside with vertex-to-vertex contacts. Sequence gives number of triangles at n-th stage.

n	a(n)
0	0
1	1
2	4
3	10
4	26
5	48
6	87
7	135
8	208
9	293
10	410
11	542
12	714
13	904
14	1141
15	1399
16	1712
17	2049
18	2448
19	2874
20	3370
21	3896
22	4499
23	5135
24	5856
25	6613
26	7462
27	8350
28	9338
29	10368
30	11505
31	12687
32	13984
33	15329
34	16796
35	18314
36	19962
37	21664
38	23503
39	25399
40	27440
41	29541
42	31794
43	34110
44	36586
45	39128
46	41837
47	44615
48	47568

[0, 1, 4, 10, 26, 48, 87, 135, 208, 293, 410, 542, 714, 904, 1141, 1399, 1712, 2049, 2448, 2874, 3370, 3896, 4499, 5135, 5856, 6613, 7462, 8350, 9338, 10368, 11505, 12687, 13984, 15329, 16796, 18314, 19962, 21664, 23503, 25399, 27440, 29541, 31794, 34110, 36586, 39128, 41837, 44615, 47568]

cp's OEIS Frontend

A269064 At stage 1, start with a unit equilateral triangle. At each successive stage add 3*(n-1) new triangles around outside with vertex-to-vertex contacts. Sequence gives number of triangles at n-th stage.

Table of values

List of values