A339837 - cp's OEIS frontend

A339837 Number of bicolored trees on n unlabeled nodes such that black nodes are not adjacent to each other and every white node is adjacent to a black node.

n	a(n)
0	1
1	1
2	1
3	2
4	4
5	8
6	18
7	44
8	111
9	296
10	819
11	2332
12	6808
13	20302
14	61559
15	189413
16	590091
17	1858187
18	5906637
19	18932016
20	61130413
21	198697205
22	649706622
23	2135958254
24	7056831766
25	23420011178
26	78048740454
27	261099605923
28	876564670090
29	2952491169904
30	9975191222798

[1, 1, 1, 2, 4, 8, 18, 44, 111, 296, 819, 2332, 6808, 20302, 61559, 189413, 590091, 1858187, 5906637, 18932016, 61130413, 198697205, 649706622, 2135958254, 7056831766, 23420011178, 78048740454, 261099605923, 876564670090, 2952491169904, 9975191222798]

cp's OEIS Frontend

A339837 Number of bicolored trees on n unlabeled nodes such that black nodes are not adjacent to each other and every white node is adjacent to a black node.

Table of values

List of values