A359985 - cp's OEIS frontend

A359985 Triangle read by rows: T(n,k) is the number of quasi series-parallel matroids on [n] with rank k, 0 <= k <= n.

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	1
6	1
7	7
8	7
9	1
10	1
11	15
12	35
13	15
14	1
15	1
16	31
17	155
18	155
19	31
20	1
21	1
22	63
23	651
24	1365
25	651
26	63
27	1
28	1
29	127
30	2667
31	10941
32	10941
33	2667
34	127
35	1
36	1
37	255
38	10795
39	82215
40	156597
41	82215
42	10795
43	255
44	1
45	1
46	511
47	43435
48	589135
49	1988007
50	1988007
51	589135
52	43435
53	511
54	1

[1, 1, 1, 1, 3, 1, 1, 7, 7, 1, 1, 15, 35, 15, 1, 1, 31, 155, 155, 31, 1, 1, 63, 651, 1365, 651, 63, 1, 1, 127, 2667, 10941, 10941, 2667, 127, 1, 1, 255, 10795, 82215, 156597, 82215, 10795, 255, 1, 1, 511, 43435, 589135, 1988007, 1988007, 589135, 43435, 511, 1]

cp's OEIS Frontend

A359985 Triangle read by rows: T(n,k) is the number of quasi series-parallel matroids on [n] with rank k, 0 <= k <= n.

Table of values

List of values