A339460 - cp's OEIS frontend

A339460 Triangle read by rows: T(n,k) is the number of k-element equivalence classes of closed meanders with 2n points.

n	a(n)
1	1
2	2
3	8
4	42
5	262
6	1820
7	4
8	13756
9	32
10	110394
11	280
12	928790
13	2328
14	4
15	8110104
16	21294
17	56
18	73040142
19	191396
20	540
21	24
22	674775338
23	1798624
24	5214
25	472
26	6370633938
27	17113152
28	48240
29	6482
30	32
31	61269105780
32	168043112
33	450616
34	83804
35	464
36	32
37	0
38	4

[1, 2, 8, 42, 262, 1820, 4, 13756, 32, 110394, 280, 928790, 2328, 4, 8110104, 21294, 56, 73040142, 191396, 540, 24, 674775338, 1798624, 5214, 472, 6370633938, 17113152, 48240, 6482, 32, 61269105780, 168043112, 450616, 83804, 464, 32, 0, 4]

cp's OEIS Frontend

A339460 Triangle read by rows: T(n,k) is the number of k-element equivalence classes of closed meanders with 2n points.

Table of values

List of values