A175912 - cp's OEIS frontend

A175912 Number of lattice paths from (0,0) to (n,n) using steps S={(k,0),(0,k),(1,1)|k>0} which never go above the line y=x.

n	a(n)
0	1
1	2
2	9
3	57
4	411
5	3181
6	25803
7	216486
8	1863139
9	16356925
10	145914573
11	1318844414
12	12051758083
13	111159508991
14	1033505202643
15	9675905948106
16	91140492185703
17	863107104436546
18	8212873185281571
19	78484928498979435
20	752928813642151089

[1, 2, 9, 57, 411, 3181, 25803, 216486, 1863139, 16356925, 145914573, 1318844414, 12051758083, 111159508991, 1033505202643, 9675905948106, 91140492185703, 863107104436546, 8212873185281571, 78484928498979435, 752928813642151089]

cp's OEIS Frontend

A175912 Number of lattice paths from (0,0) to (n,n) using steps S={(k,0),(0,k),(1,1)|k>0} which never go above the line y=x.

Table of values

List of values