A356558 - cp's OEIS frontend

A356558 Triangle read by rows: T(n,k), where n, k >= 2, is the number of n-element unlabeled connected series-parallel posets with k ordinal terms that are either the singleton or disconnected posets.

n	a(n)
2	1
3	2
4	1
5	5
6	3
7	1
8	16
9	9
10	4
11	1
12	52
13	31
14	14
15	5
16	1
17	188
18	108
19	52
20	20
21	6
22	1
23	690
24	402
25	193
26	80
27	27
28	7
29	1
30	2638
31	1523
32	744
33	315
34	116
35	35
36	8
37	1
38	10272
39	5934
40	2908
41	1261
42	483
43	161
44	44
45	9
46	1
47	40782
48	23505
49	11580
50	5085
51	2010
52	707
53	216
54	54
55	10
56	1

[1, 2, 1, 5, 3, 1, 16, 9, 4, 1, 52, 31, 14, 5, 1, 188, 108, 52, 20, 6, 1, 690, 402, 193, 80, 27, 7, 1, 2638, 1523, 744, 315, 116, 35, 8, 1, 10272, 5934, 2908, 1261, 483, 161, 44, 9, 1, 40782, 23505, 11580, 5085, 2010, 707, 216, 54, 10, 1]

cp's OEIS Frontend

A356558 Triangle read by rows: T(n,k), where n, k >= 2, is the number of n-element unlabeled connected series-parallel posets with k ordinal terms that are either the singleton or disconnected posets.

Table of values

List of values