A110220 - cp's OEIS frontend

A110220 Triangle read by rows: T(n,k) (0 <= k <= floor(n/2)) is the number of lattice paths from (0,0) to (2n,0) consisting of steps U=(1,1), D=(1,-1), H=(2,0), never going below the x-axis (i.e., Schroeder paths) and having k UH's.

n	a(n)
0	1
1	2
2	5
3	1
4	15
5	7
6	51
7	37
8	2
9	188
10	181
11	25
12	731
13	866
14	204
15	5
16	2950
17	4124
18	1393
19	91
20	12235
21	19657
22	8672
23	1008
24	14
25	51822
26	93937
27	51147
28	8856
29	336
30	223191
31	450220
32	291470
33	68085
34	4710
35	42
36	974427
37	2163910
38	1622665
39	480535
40	50655
41	1254
42	4302645

[1, 2, 5, 1, 15, 7, 51, 37, 2, 188, 181, 25, 731, 866, 204, 5, 2950, 4124, 1393, 91, 12235, 19657, 8672, 1008, 14, 51822, 93937, 51147, 8856, 336, 223191, 450220, 291470, 68085, 4710, 42, 974427, 2163910, 1622665, 480535, 50655, 1254, 4302645]

cp's OEIS Frontend

A110220 Triangle read by rows: T(n,k) (0 <= k <= floor(n/2)) is the number of lattice paths from (0,0) to (2n,0) consisting of steps U=(1,1), D=(1,-1), H=(2,0), never going below the x-axis (i.e., Schroeder paths) and having k UH's.

Table of values

List of values