A301469 - cp's OEIS frontend

A301469 Signed recurrence over enriched r-trees: a(n) = 2 * (-1)^n + Sum_y Product_{i in y} a(y) where the sum is over all integer partitions of n - 1.

n	a(n)
0	2
1	-1
2	1
3	0
4	0
5	1
6	0
7	1
8	1
9	1
10	2
11	3
12	3
13	6
14	7
15	11
16	17
17	23
18	35
19	53
20	75
21	119
22	173
23	264
24	398
25	603
26	911
27	1411
28	2114
29	3279
30	4977
31	7696
32	11760
33	18253
34	27909
35	43451
36	66675
37	103945
38	160096
39	249904
40	385876
41	603107
42	933474
43	1461967
44	2266384
45	3553167
46	5521053
47	8664117
48	13485744

[2, -1, 1, 0, 0, 1, 0, 1, 1, 1, 2, 3, 3, 6, 7, 11, 17, 23, 35, 53, 75, 119, 173, 264, 398, 603, 911, 1411, 2114, 3279, 4977, 7696, 11760, 18253, 27909, 43451, 66675, 103945, 160096, 249904, 385876, 603107, 933474, 1461967, 2266384, 3553167, 5521053, 8664117, 13485744]

cp's OEIS Frontend

A301469 Signed recurrence over enriched r-trees: a(n) = 2 * (-1)^n + Sum_y Product_{i in y} a(y) where the sum is over all integer partitions of n - 1.

Table of values

List of values