A284230 - cp's OEIS frontend

A284230 Number of 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	2
2	5
3	24
4	111
5	762
6	5127
7	45588
8	400593
9	4370634
10	47311677
11	611446464
12	7857786015
13	117346361778
14	1745000283087
15	29562853594284
16	499180661754849
17	9458257569095826
18	178734707493557301
19	3744942786114870888
20	78294815164675006479
21	1797384789345147560298

[1, 2, 5, 24, 111, 762, 5127, 45588, 400593, 4370634, 47311677, 611446464, 7857786015, 117346361778, 1745000283087, 29562853594284, 499180661754849, 9458257569095826, 178734707493557301, 3744942786114870888, 78294815164675006479, 1797384789345147560298]

cp's OEIS Frontend

A284230 Number of 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.

Table of values

List of values