A337869 - cp's OEIS frontend

A337869 The number of random walks on the simple square lattice that return to the origin (0,0) after 2n steps and do not pass through (0,0) or (1,0) at intermediate steps.

n	a(n)
1	3
2	13
3	106
4	1073
5	12142
6	147090
7	1865772
8	24463905
9	328887346
10	4508608610
11	62781858592
12	885513974674
13	12624162072740
14	181611275997040
15	2633023723495116
16	38431604042148681
17	564258290166041298
18	8327627696761062714
19	123471550301117915892

[3, 13, 106, 1073, 12142, 147090, 1865772, 24463905, 328887346, 4508608610, 62781858592, 885513974674, 12624162072740, 181611275997040, 2633023723495116, 38431604042148681, 564258290166041298, 8327627696761062714, 123471550301117915892]

cp's OEIS Frontend

A337869 The number of random walks on the simple square lattice that return to the origin (0,0) after 2n steps and do not pass through (0,0) or (1,0) at intermediate steps.

Table of values

List of values