A376633 - cp's OEIS frontend

A376633 T(n,k) is the number of nonisomorphic n-element self-dual posets (or partially ordered sets) with k arcs in the Hasse diagram, irregular triangle read by rows.

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	1
9	2
10	2
11	2
12	1
13	1
14	2
15	3
16	5
17	2
18	1
19	1
20	1
21	2
22	4
23	9
24	11
25	12
26	5
27	4
28	1
29	1
30	1
31	2
32	4
33	10
34	16
35	26
36	22
37	21
38	10
39	5
40	0
41	1
42	1
43	1
44	2
45	4
46	11
47	20
48	44
49	65
50	98
51	86
52	79
53	41
54	25
55	8
56	4
57	2
58	2
59	1
60	1
61	2
62	4
63	11
64	21
65	51
66	92
67	175
68	220
69	276
70	237
71	208
72	103
73	67
74	25
75	18
76	5
77	3
78	0
79	1
80	1
81	1
82	2
83	4
84	11
85	22
86	55
87	114
88	264
89	462
90	798
91	1015
92	1294
93	1180
94	1035
95	676
96	477
97	243
98	149
99	57
100	36
101	13
102	8
103	2
104	4
105	1
106	1
107	1
108	2
109	4
110	11
111	22
112	56
113	121
114	303
115	614
116	1264
117	2042
118	2348
119	3995
120	4755
121	4272
122	3910
123	2680
124	1977
125	1078
126	697
127	300
128	189
129	60
130	50
131	15
132	12
133	0
134	3
135	0
136	1

[1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 2, 3, 5, 2, 1, 1, 1, 2, 4, 9, 11, 12, 5, 4, 1, 1, 1, 2, 4, 10, 16, 26, 22, 21, 10, 5, 0, 1, 1, 1, 2, 4, 11, 20, 44, 65, 98, 86, 79, 41, 25, 8, 4, 2, 2, 1, 1, 2, 4, 11, 21, 51, 92, 175, 220, 276, 237, 208, 103, 67, 25, 18, 5, 3, 0, 1, 1, 1, 2, 4, 11, 22, 55, 114, 264, 462, 798, 1015, 1294, 1180, 1035, 676, 477, 243, 149, 57, 36, 13, 8, 2, 4, 1, 1, 1, 2, 4, 11, 22, 56, 121, 303, 614, 1264, 2042, 2348, 3995, 4755, 4272, 3910, 2680, 1977, 1078, 697, 300, 189, 60, 50, 15, 12, 0, 3, 0, 1]

cp's OEIS Frontend

A376633 T(n,k) is the number of nonisomorphic n-element self-dual posets (or partially ordered sets) with k arcs in the Hasse diagram, irregular triangle read by rows.

Table of values

List of values