A026671 - cp's OEIS frontend

A026671 Number of lattice paths from (0,0) to (n,n) with steps (0,1), (1,0) and, when on the diagonal, (1,1).

n	a(n)
0	1
1	3
2	11
3	43
4	173
5	707
6	2917
7	12111
8	50503
9	211263
10	885831
11	3720995
12	15652239
13	65913927
14	277822147
15	1171853635
16	4945846997
17	20884526283
18	88224662549
19	372827899079
20	1576001732485
21	6663706588179
22	28181895551161
23	119208323665543
24	504329070986033
25	2133944799315027

[1, 3, 11, 43, 173, 707, 2917, 12111, 50503, 211263, 885831, 3720995, 15652239, 65913927, 277822147, 1171853635, 4945846997, 20884526283, 88224662549, 372827899079, 1576001732485, 6663706588179, 28181895551161, 119208323665543, 504329070986033, 2133944799315027]

cp's OEIS Frontend

A026671 Number of lattice paths from (0,0) to (n,n) with steps (0,1), (1,0) and, when on the diagonal, (1,1).

Table of values

List of values