A349409 - cp's OEIS frontend

A349409 Triangle read by rows: T(n,k) is the number of planar tanglegrams of size n with 0 <= k < n leaf-matched pairs. A leaf matched pair is a pair of non-leaf vertices (u,v) in the tanglegram such that the induced subtrees rooted and u and v also form a tanglegram (equivalently, the leaves in these two subtrees are matched by the matching that forms the original tanglegram).

n	a(n)
1	1
2	0
3	1
4	0
5	1
6	1
7	0
8	5
9	4
10	2
11	0
12	34
13	28
14	11
15	3
16	0
17	273
18	239
19	102
20	29
21	6
22	0
23	2436
24	2283
25	1045
26	325
27	73
28	11
29	0
30	23391
31	23475
32	11539
33	3852
34	968
35	181
36	23
37	0
38	237090
39	254309
40	133690
41	47640
42	12923
43	2756
44	444
45	46
46	0
47	2505228
48	2864283
49	1605280
50	607743
51	175976
52	40903
53	7650
54	1085
55	98

[1, 0, 1, 0, 1, 1, 0, 5, 4, 2, 0, 34, 28, 11, 3, 0, 273, 239, 102, 29, 6, 0, 2436, 2283, 1045, 325, 73, 11, 0, 23391, 23475, 11539, 3852, 968, 181, 23, 0, 237090, 254309, 133690, 47640, 12923, 2756, 444, 46, 0, 2505228, 2864283, 1605280, 607743, 175976, 40903, 7650, 1085, 98]

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Table of values

List of values