A126186 - cp's OEIS frontend

A126186 Triangle read by rows: T(n,k) is number of hex trees with n edges and level of first leaf (in the preorder traversal) equal to k (1 <= k <= n).

n	a(n)
1	3
2	1
3	9
4	3
5	6
6	27
7	10
8	19
9	27
10	81
11	36
12	66
13	90
14	108
15	243
16	137
17	245
18	325
19	378
20	405
21	729
22	543
23	954
24	1242
25	1416
26	1485
27	1458
28	2187
29	2219
30	3848
31	4944
32	5563
33	5760
34	5589
35	5103
36	6561
37	9285
38	15942
39	20286
40	22620
41	23235
42	22410
43	20412
44	17496
45	19683
46	39587
47	67442
48	85194

[3, 1, 9, 3, 6, 27, 10, 19, 27, 81, 36, 66, 90, 108, 243, 137, 245, 325, 378, 405, 729, 543, 954, 1242, 1416, 1485, 1458, 2187, 2219, 3848, 4944, 5563, 5760, 5589, 5103, 6561, 9285, 15942, 20286, 22620, 23235, 22410, 20412, 17496, 19683, 39587, 67442, 85194]

cp's OEIS Frontend

A126186 Triangle read by rows: T(n,k) is number of hex trees with n edges and level of first leaf (in the preorder traversal) equal to k (1 <= k <= n).

Table of values

List of values