A072851 - cp's OEIS frontend

A072851 a(n) = s(2n) where s(0) = 0, s(1) = s(2) = 1, s(n) = abs(Sum_{k=2..n-1} (-1)^k s(n-k) * s(k)).

n	a(n)
0	0
1	1
2	0
3	1
4	1
5	1
6	0
7	1
8	2
9	1
10	2
11	3
12	1
13	3
14	4
15	1
16	3
17	5
18	6
19	1
20	7
21	29
22	14
23	41
24	82
25	39
26	58
27	109
28	119
29	1
30	120
31	579
32	432
33	675
34	1320
35	1325
36	291
37	259
38	3332
39	3657
40	3724
41	6015
42	11114
43	6465
44	4325
45	20433
46	28884
47	381
48	5813
49	91505
50	96956
51	70329
52	106037
53	260323
54	260690
55	78399

[0, 1, 0, 1, 1, 1, 0, 1, 2, 1, 2, 3, 1, 3, 4, 1, 3, 5, 6, 1, 7, 29, 14, 41, 82, 39, 58, 109, 119, 1, 120, 579, 432, 675, 1320, 1325, 291, 259, 3332, 3657, 3724, 6015, 11114, 6465, 4325, 20433, 28884, 381, 5813, 91505, 96956, 70329, 106037, 260323, 260690, 78399]

cp's OEIS Frontend

A072851 a(n) = s(2n) where s(0) = 0, s(1) = s(2) = 1, s(n) = abs(Sum_{k=2..n-1} (-1)^k s(n-k) * s(k)).

Table of values

List of values

cp's OEIS Frontend

A072851 a(n) = s(2*n) where s(0) = 0, s(1) = s(2) = 1, s(n) = abs(Sum_{k=2..n-1} (-1)^k * s(n-k) * s(k)).

Table of values

List of values

A072851 a(n) = s(2n) where s(0) = 0, s(1) = s(2) = 1, s(n) = abs(Sum_{k=2..n-1} (-1)^k s(n-k) * s(k)).