A277921 - cp's OEIS frontend

A277921 Number of positive walks with n steps {-4,-3,-2,-1,0,1,2,3,4} starting at the origin, ending at altitude 2, and staying strictly above the x-axis.

n	a(n)
0	0
1	1
2	4
3	23
4	142
5	950
6	6662
7	48420
8	361378
9	2753687
10	21334313
11	167551836
12	1330894754
13	10673486660
14	86306300366
15	702872359332
16	5759986152740
17	47463395965108
18	393027545388119
19	3268814565684836
20	27294209365111429
21	228718165320327356
22	1922825557218427271

[0, 1, 4, 23, 142, 950, 6662, 48420, 361378, 2753687, 21334313, 167551836, 1330894754, 10673486660, 86306300366, 702872359332, 5759986152740, 47463395965108, 393027545388119, 3268814565684836, 27294209365111429, 228718165320327356, 1922825557218427271]

cp's OEIS Frontend

A277921 Number of positive walks with n steps {-4,-3,-2,-1,0,1,2,3,4} starting at the origin, ending at altitude 2, and staying strictly above the x-axis.

Table of values

List of values