A273722 - cp's OEIS frontend

A273722 The number of valleys of width 1 (i.e., DHU configurations, where U=(0,1), H(1,0), D=(0,-1)) in all bargraphs of semiperimeter n (n>=2).

n	a(n)
2	0
3	0
4	0
5	0
6	1
7	7
8	34
9	143
10	558
11	2083
12	7559
13	26913
14	94547
15	328943
16	1136218
17	3903245
18	13352270
19	45524764
20	154811018
21	525345268
22	1779722313
23	6020903806
24	20346143381
25	68691126090
26	231732871764
27	781268589267
28	2632605033729
29	8867115559325
30	29855369535397

[0, 0, 0, 0, 1, 7, 34, 143, 558, 2083, 7559, 26913, 94547, 328943, 1136218, 3903245, 13352270, 45524764, 154811018, 525345268, 1779722313, 6020903806, 20346143381, 68691126090, 231732871764, 781268589267, 2632605033729, 8867115559325, 29855369535397]

cp's OEIS Frontend

A273722 The number of valleys of width 1 (i.e., DHU configurations, where U=(0,1), H(1,0), D=(0,-1)) in all bargraphs of semiperimeter n (n>=2).

Table of values

List of values