A277923 - cp's OEIS frontend

A277923 Number of positive walks with n steps {-4,-3,-2,-1,1,2,3,4} starting at the origin, ending at altitude 2, and staying strictly above the x-axis.

n	a(n)
0	0
1	1
2	3
3	16
4	84
5	505
6	3121
7	20180
8	133604
9	904512
10	6224305
11	43432093
12	306524670
13	2184389874
14	15695947669
15	113595885023
16	827299204132
17	6058526521135
18	44586954104578
19	329579179316696
20	2445858862779018
21	18216235711289695
22	136113075865844577
23	1020074492384232296

[0, 1, 3, 16, 84, 505, 3121, 20180, 133604, 904512, 6224305, 43432093, 306524670, 2184389874, 15695947669, 113595885023, 827299204132, 6058526521135, 44586954104578, 329579179316696, 2445858862779018, 18216235711289695, 136113075865844577, 1020074492384232296]

cp's OEIS Frontend

A277923 Number of positive walks with n steps {-4,-3,-2,-1,1,2,3,4} starting at the origin, ending at altitude 2, and staying strictly above the x-axis.

Table of values

List of values