A302919 - cp's OEIS frontend

A302919 The number of ways of placing 2n-1 white balls and 2n-1 black balls into unlabeled bins such that each bin has both an odd number of white balls and black balls.

n	a(n)
1	1
2	2
3	4
4	12
5	32
6	85
7	217
8	539
9	1316
10	3146
11	7374
12	16969
13	38387
14	85452
15	187456
16	405659
17	866759
18	1830086
19	3821072
20	7894447
21	16148593
22	32723147
23	65719405
24	130871128
25	258513076
26	506724988
27	985968770
28	1904992841
29	3655873294
30	6970687150
31	13208622956
32	24879427889
33	46593011280
34	86773920240
35	160742462714
36	296227087942
37	543183754454
38	991213989213

[1, 2, 4, 12, 32, 85, 217, 539, 1316, 3146, 7374, 16969, 38387, 85452, 187456, 405659, 866759, 1830086, 3821072, 7894447, 16148593, 32723147, 65719405, 130871128, 258513076, 506724988, 985968770, 1904992841, 3655873294, 6970687150, 13208622956, 24879427889, 46593011280, 86773920240, 160742462714, 296227087942, 543183754454, 991213989213]

cp's OEIS Frontend

A302919 The number of ways of placing 2n-1 white balls and 2n-1 black balls into unlabeled bins such that each bin has both an odd number of white balls and black balls.

Table of values

List of values