A110110 - cp's OEIS frontend

A110110 Number of symmetric Schroeder paths of length 2n (A Schroeder path of length 2n is a lattice path from (0,0) to (2n,0) consisting of U=(1,1), D=(1,-1) and H=(2,0) steps and never going below the x-axis).

n	a(n)
0	1
1	2
2	4
3	8
4	18
5	38
6	88
7	192
8	450
9	1002
10	2364
11	5336
12	12642
13	28814
14	68464
15	157184
16	374274
17	864146
18	2060980
19	4780008
20	11414898
21	26572086
22	63521352
23	148321344
24	354870594
25	830764794
26	1989102444
27	4666890936
28	11180805570
29	26283115038

[1, 2, 4, 8, 18, 38, 88, 192, 450, 1002, 2364, 5336, 12642, 28814, 68464, 157184, 374274, 864146, 2060980, 4780008, 11414898, 26572086, 63521352, 148321344, 354870594, 830764794, 1989102444, 4666890936, 11180805570, 26283115038]

cp's OEIS Frontend

A110110 Number of symmetric Schroeder paths of length 2n (A Schroeder path of length 2n is a lattice path from (0,0) to (2n,0) consisting of U=(1,1), D=(1,-1) and H=(2,0) steps and never going below the x-axis).

Table of values

List of values