A079280 - cp's OEIS frontend

A079280 Number of log-concave paths of length n starting from the origin (0,0) with steps from {N=(0,1), E=(1,0) and S=(0,-1)} that stay in the second octant and never touch the line y=x except possibly at the beginning or the end.

n	a(n)
1	1
2	2
3	2
4	5
5	7
6	17
7	26
8	62
9	99
10	233
11	382
12	890
13	1486
14	3434
15	5812
16	13340
17	22819
18	52073
19	89846
20	204002
21	354522
22	801422
23	1401292
24	3155300
25	5546382
26	12444842
27	21977516
28	49155332
29	87167164
30	194392628
31	345994216
32	769547192
33	1374282019
34	3049104233

[1, 2, 2, 5, 7, 17, 26, 62, 99, 233, 382, 890, 1486, 3434, 5812, 13340, 22819, 52073, 89846, 204002, 354522, 801422, 1401292, 3155300, 5546382, 12444842, 21977516, 49155332, 87167164, 194392628, 345994216, 769547192, 1374282019, 3049104233]

cp's OEIS Frontend

A079280 Number of log-concave paths of length n starting from the origin (0,0) with steps from {N=(0,1), E=(1,0) and S=(0,-1)} that stay in the second octant and never touch the line y=x except possibly at the beginning or the end.

Table of values

List of values