A284231 - cp's OEIS frontend

A284231 Total number of nodes summed over all self-avoiding planar walks 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	5
2	21
3	152
4	975
5	8835
6	75499
7	830180
8	8819417
9	114384573
10	1450018173
11	21689509992
12	319180726887
13	5411092531323
14	90615453774771
15	1717272516535812
16	32234085990345105
17	675335923050095253
18	14040521125141683717
19	322252846702242056280
20	7349647183279936080543

[1, 5, 21, 152, 975, 8835, 75499, 830180, 8819417, 114384573, 1450018173, 21689509992, 319180726887, 5411092531323, 90615453774771, 1717272516535812, 32234085990345105, 675335923050095253, 14040521125141683717, 322252846702242056280, 7349647183279936080543]

cp's OEIS Frontend

Table of values

List of values