A284416 - cp's OEIS frontend

A284416 Number of self-avoiding planar walks of length 2n starting at (0,0), ending at (n,0), remaining in the first quadrant and using steps (0,1), (1,0), (1,1), (-1,1), and (1,-1) with the restriction that (0,1) is never used below the diagonal and (1,0) is never used above the diagonal.

n	a(n)
0	1
1	1
2	1
3	7
4	17
5	116
6	536
7	3732
8	21609
9	152225
10	991680
11	7142207
12	49671146
13	364955208
14	2644449147
15	19764753353
16	147264417970
17	1116423286310
18	8488332597668
19	65109780090520
20	502742629038600
21	3893865922507871
22	30436537169536769
23	237651376621912220

[1, 1, 1, 7, 17, 116, 536, 3732, 21609, 152225, 991680, 7142207, 49671146, 364955208, 2644449147, 19764753353, 147264417970, 1116423286310, 8488332597668, 65109780090520, 502742629038600, 3893865922507871, 30436537169536769, 237651376621912220]

cp's OEIS Frontend

A284416 Number of self-avoiding planar walks of length 2n starting at (0,0), ending at (n,0), remaining in the first quadrant and using steps (0,1), (1,0), (1,1), (-1,1), and (1,-1) with the restriction that (0,1) is never used below the diagonal and (1,0) is never used above the diagonal.

Table of values

List of values