A273721 - cp's OEIS frontend

A273721 Triangle read by rows: T(n,k) is the number of bargraphs of semiperimeter n having k valleys of width 1 (i.e., DHU configurations, where U=(0,1), H=(1,0), D=(0,-1)), (n>=2, k>=0).

n	a(n)
2	1
3	2
4	5
5	13
6	34
7	1
8	90
9	7
10	241
11	34
12	652
13	141
14	1
15	1780
16	536
17	11
18	4899
19	1929
20	77
21	13581
22	6690
23	433
24	1
25	37893
26	22601
27	2132
28	16
29	106340
30	74898
31	9598
32	151
33	299978
34	244632
35	40517
36	1091
37	1
38	850187
39	790144
40	162988
41	6670
42	22
43	2419788
44	2529873
45	631655
46	36330
47	268

[1, 2, 5, 13, 34, 1, 90, 7, 241, 34, 652, 141, 1, 1780, 536, 11, 4899, 1929, 77, 13581, 6690, 433, 1, 37893, 22601, 2132, 16, 106340, 74898, 9598, 151, 299978, 244632, 40517, 1091, 1, 850187, 790144, 162988, 6670, 22, 2419788, 2529873, 631655, 36330, 268]

cp's OEIS Frontend

A273721 Triangle read by rows: T(n,k) is the number of bargraphs of semiperimeter n having k valleys of width 1 (i.e., DHU configurations, where U=(0,1), H=(1,0), D=(0,-1)), (n>=2, k>=0).

Table of values

List of values