A126177 - cp's OEIS frontend

A126177 Triangle read by rows: T(n,k) is number of hex trees with n edges and k leaves (n >= 1, 1 <= k <= 1 + floor(n/2)).

n	a(n)
1	3
2	9
3	1
4	27
5	9
6	81
7	54
8	2
9	243
10	270
11	30
12	729
13	1215
14	270
15	5
16	2187
17	5103
18	1890
19	105
20	6561
21	20412
22	11340
23	1260
24	14
25	19683
26	78732
27	61236
28	11340
29	378
30	59049
31	295245
32	306180
33	85050
34	5670
35	42
36	177147
37	1082565
38	1443420
39	561330
40	62370
41	1386
42	531441
43	3897234

[3, 9, 1, 27, 9, 81, 54, 2, 243, 270, 30, 729, 1215, 270, 5, 2187, 5103, 1890, 105, 6561, 20412, 11340, 1260, 14, 19683, 78732, 61236, 11340, 378, 59049, 295245, 306180, 85050, 5670, 42, 177147, 1082565, 1443420, 561330, 62370, 1386, 531441, 3897234]

cp's OEIS Frontend

A126177 Triangle read by rows: T(n,k) is number of hex trees with n edges and k leaves (n >= 1, 1 <= k <= 1 + floor(n/2)).

Table of values

List of values