A171971 - cp's OEIS frontend

A171971 Integer part of the area of an equilateral triangle with side length n.

n	a(n)
1	0
2	1
3	3
4	6
5	10
6	15
7	21
8	27
9	35
10	43
11	52
12	62
13	73
14	84
15	97
16	110
17	125
18	140
19	156
20	173
21	190
22	209
23	229
24	249
25	270
26	292
27	315
28	339
29	364
30	389
31	416
32	443
33	471
34	500
35	530
36	561
37	592
38	625
39	658
40	692
41	727
42	763
43	800
44	838
45	876
46	916
47	956
48	997
49	1039
50	1082
51	1126
52	1170
53	1216
54	1262
55	1309

[0, 1, 3, 6, 10, 15, 21, 27, 35, 43, 52, 62, 73, 84, 97, 110, 125, 140, 156, 173, 190, 209, 229, 249, 270, 292, 315, 339, 364, 389, 416, 443, 471, 500, 530, 561, 592, 625, 658, 692, 727, 763, 800, 838, 876, 916, 956, 997, 1039, 1082, 1126, 1170, 1216, 1262, 1309]

cp's OEIS Frontend

A171971 Integer part of the area of an equilateral triangle with side length n.

Table of values

List of values