A359626 - cp's OEIS frontend

A359626 a(n) is equal to the number of filled unit triangles in a regular triangle whose coloring scheme is given in the comments.

n	a(n)
1	1
2	4
3	9
4	15
5	21
6	27
7	34
8	43
9	54
10	66
11	78
12	90
13	103
14	118
15	135
16	153
17	171
18	189
19	208
20	229
21	252
22	276
23	300
24	324
25	349
26	376
27	405
28	435
29	465
30	495
31	526
32	559
33	594
34	630
35	666
36	702
37	739
38	778
39	819
40	861
41	903
42	945
43	988
44	1033
45	1080
46	1128
47	1176
48	1224
49	1273
50	1324
51	1377
52	1431
53	1485
54	1539
55	1594
56	1651
57	1710
58	1770
59	1830
60	1890
61	1951
62	2014
63	2079

[1, 4, 9, 15, 21, 27, 34, 43, 54, 66, 78, 90, 103, 118, 135, 153, 171, 189, 208, 229, 252, 276, 300, 324, 349, 376, 405, 435, 465, 495, 526, 559, 594, 630, 666, 702, 739, 778, 819, 861, 903, 945, 988, 1033, 1080, 1128, 1176, 1224, 1273, 1324, 1377, 1431, 1485, 1539, 1594, 1651, 1710, 1770, 1830, 1890, 1951, 2014, 2079]

cp's OEIS Frontend

A359626 a(n) is equal to the number of filled unit triangles in a regular triangle whose coloring scheme is given in the comments.

Table of values

List of values