A339228 - cp's OEIS frontend

A339228 Triangle read by rows: T(n,k) is the number of oriented series-parallel networks with n colored elements using exactly k colors.

n	a(n)
1	1
2	2
3	3
4	5
5	22
6	19
7	15
8	146
9	321
10	195
11	48
12	970
13	4116
14	5972
15	2791
16	167
17	6601
18	48245
19	125778
20	135235
21	51303
22	602
23	46012
24	546570
25	2281528
26	4238415
27	3609966
28	1152019
29	2256
30	328188
31	6118320
32	38437972
33	109815445
34	157612413
35	111006329
36	30564075

[1, 2, 3, 5, 22, 19, 15, 146, 321, 195, 48, 970, 4116, 5972, 2791, 167, 6601, 48245, 125778, 135235, 51303, 602, 46012, 546570, 2281528, 4238415, 3609966, 1152019, 2256, 328188, 6118320, 38437972, 109815445, 157612413, 111006329, 30564075]

cp's OEIS Frontend

A339228 Triangle read by rows: T(n,k) is the number of oriented series-parallel networks with n colored elements using exactly k colors.

Table of values

List of values