A327871 - cp's OEIS frontend

A327871 Number of 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	1
2	3
3	14
4	70
5	369
6	2002
7	11076
8	62127
9	352070
10	2010998
11	11559030
12	66780155
13	387444085
14	2255875650
15	13174629240
16	77143234950
17	452738296890
18	2662359410158
19	15683996769460
20	92540962166016
21	546799192200261
22	3235027635603828
23	19161631961190036
24	113617798289197650

[1, 1, 3, 14, 70, 369, 2002, 11076, 62127, 352070, 2010998, 11559030, 66780155, 387444085, 2255875650, 13174629240, 77143234950, 452738296890, 2662359410158, 15683996769460, 92540962166016, 546799192200261, 3235027635603828, 19161631961190036, 113617798289197650]

cp's OEIS Frontend

A327871 Number of 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