A334615 - cp's OEIS frontend

A334615 a(n) is the number of semi-meanders with n top arches that has no arch of length 1 at the ends of the top arch configuration and no arch of length 1 adjacent to the center of the top arch configuration.

n	a(n)
2	0
3	0
4	0
5	2
6	0
7	10
8	6
9	72
10	86
11	602
12	982
13	5426
14	10558
15	51246
16	111602
17	500076
18	1177210
19	5001518
20	12462762
21	51003906
22	132711162
23	528420604
24	1422458280
25	5547419160
26	15347206464

[0, 0, 0, 2, 0, 10, 6, 72, 86, 602, 982, 5426, 10558, 51246, 111602, 500076, 1177210, 5001518, 12462762, 51003906, 132711162, 528420604, 1422458280, 5547419160, 15347206464]

cp's OEIS Frontend

A334615 a(n) is the number of semi-meanders with n top arches that has no arch of length 1 at the ends of the top arch configuration and no arch of length 1 adjacent to the center of the top arch configuration.

Table of values

List of values