A327872 - cp's OEIS frontend

A327872 Total number of nodes in all self-avoiding planar walks starting at (0,0), ending at (n,n), remaining in the first quadrant and using steps (0,1), (-1,1), and (1,-1) with the restriction that (-1,1) and (1,-1) are always immediately followed by (0,1).

n	a(n)
0	1
1	4
2	21
3	148
4	980
5	6444
6	41888
7	270088
8	1730079
9	11023480
10	69930146
11	441988260
12	2784820519
13	17499028820
14	109701885600
15	686313858480
16	4285914086100
17	26721615383496
18	166361793070466
19	1034375862301240
20	6423778211164860
21	39850734775066644
22	246976735839649218

[1, 4, 21, 148, 980, 6444, 41888, 270088, 1730079, 11023480, 69930146, 441988260, 2784820519, 17499028820, 109701885600, 686313858480, 4285914086100, 26721615383496, 166361793070466, 1034375862301240, 6423778211164860, 39850734775066644, 246976735839649218]

cp's OEIS Frontend

A327872 Total number of nodes in all self-avoiding planar walks starting at (0,0), ending at (n,n), remaining in the first quadrant and using steps (0,1), (-1,1), and (1,-1) with the restriction that (-1,1) and (1,-1) are always immediately followed by (0,1).

Table of values

List of values