A300865 - cp's OEIS frontend

A300865 Signed recurrence over binary enriched p-trees: a(n) = (-1)^(n-1) + Sum_{x + y = n, 0 < x <= y < n} a(x) * a(y).

n	a(n)
1	1
2	0
3	1
4	0
5	1
6	1
7	2
8	2
9	4
10	6
11	10
12	16
13	27
14	46
15	77
16	131
17	224
18	391
19	672
20	1180
21	2050
22	3626
23	6344
24	11276
25	19863
26	35479
27	62828
28	112685
29	200462
30	360627
31	644199
32	1162296
33	2083572
34	3768866
35	6777314
36	12289160
37	22158106
38	40255496
39	72765144
40	132453122
41	239936528
42	437445448

[1, 0, 1, 0, 1, 1, 2, 2, 4, 6, 10, 16, 27, 46, 77, 131, 224, 391, 672, 1180, 2050, 3626, 6344, 11276, 19863, 35479, 62828, 112685, 200462, 360627, 644199, 1162296, 2083572, 3768866, 6777314, 12289160, 22158106, 40255496, 72765144, 132453122, 239936528, 437445448]

cp's OEIS Frontend

A300865 Signed recurrence over binary enriched p-trees: a(n) = (-1)^(n-1) + Sum_{x + y = n, 0 < x <= y < n} a(x) * a(y).

Table of values

List of values