A175939 - cp's OEIS frontend

A175939 Number of lattice paths from (0,0) to (n,n) using steps S={(k,0),(0,k),(r,r)|k>0,0 which never go above the line y=x.

n	a(n)
0	1
1	2
2	10
3	62
4	448
5	3495
6	28640
7	242946
8	2114829
9	18783658
10	169546150
11	1550728135
12	14340859992
13	133867779775
14	1259689173181
15	11936488052113
16	113799596287017
17	1090803942244627
18	10505978544362607
19	101623141479156708
20	986801698075230291

[1, 2, 10, 62, 448, 3495, 28640, 242946, 2114829, 18783658, 169546150, 1550728135, 14340859992, 133867779775, 1259689173181, 11936488052113, 113799596287017, 1090803942244627, 10505978544362607, 101623141479156708, 986801698075230291]

cp's OEIS Frontend

A175939 Number of lattice paths from (0,0) to (n,n) using steps S={(k,0),(0,k),(r,r)|k>0,0 which never go above the line y=x.

Table of values

List of values