A371636 - cp's OEIS frontend

A371636 For any number k >= 0, let T_k be the triangle with values in {-1, 0, +1} whose base corresponds to the balanced ternary expansion of k (without leading zeros) and other values, say t above u and v, satisfy t+u+v = 0 mod 3; this sequence lists the numbers k such that T_k has 3-fold rotational symmetry.

n	a(n)
1	0
2	1
3	4
4	13
5	19
6	25
7	40
8	103
9	112
10	121
11	154
12	214
13	364
14	442
15	505
16	595
17	673
18	763
19	826
20	913
21	1003
22	1093
23	1144
24	1369
25	1621
26	1915
27	2167
28	2392
29	2776
30	3028
31	3280
32	3628
33	4420
34	4996
35	5668
36	6244
37	7036
38	8203
39	9022
40	9841
41	10459
42	10594
43	11782
44	12304
45	13411
46	13627
47	14419

[0, 1, 4, 13, 19, 25, 40, 103, 112, 121, 154, 214, 364, 442, 505, 595, 673, 763, 826, 913, 1003, 1093, 1144, 1369, 1621, 1915, 2167, 2392, 2776, 3028, 3280, 3628, 4420, 4996, 5668, 6244, 7036, 8203, 9022, 9841, 10459, 10594, 11782, 12304, 13411, 13627, 14419]

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