A077055 - cp's OEIS frontend

A077055 Call two meanders from A005316 equivalent if they differ by a reflection in the Y axis (if n even) or by reflections in the X or Y axes (if n odd). Sequence gives number of inequivalent meanders with n crossings.

n	a(n)
0	1
1	1
2	1
3	2
4	3
5	8
6	13
7	42
8	72
9	273
10	475
11	1970
12	3506
13	15368
14	27888
15	126510
16	233809
17	1086546
18	2039564
19	9652364
20	18360296
21	88172609
22	169610371
23	824506191
24	1601297937
25	7865294687
26	15401847339
27	76331857094
28	150547538649
29	751981532942
30	1492452957398

[1, 1, 1, 2, 3, 8, 13, 42, 72, 273, 475, 1970, 3506, 15368, 27888, 126510, 233809, 1086546, 2039564, 9652364, 18360296, 88172609, 169610371, 824506191, 1601297937, 7865294687, 15401847339, 76331857094, 150547538649, 751981532942, 1492452957398]

cp's OEIS Frontend

A077055 Call two meanders from A005316 equivalent if they differ by a reflection in the Y axis (if n even) or by reflections in the X or Y axes (if n odd). Sequence gives number of inequivalent meanders with n crossings.

Table of values

List of values