A339297 - cp's OEIS frontend

A339297 Triangle read by rows: T(n,k) is the number of oriented series-parallel networks with n colored elements and without multiple unit elements in parallel using exactly k colors.

n	a(n)
1	1
2	1
3	2
4	2
5	12
6	12
7	5
8	64
9	162
10	108
11	13
12	354
13	1734
14	2760
15	1380
16	36
17	1992
18	16977
19	48716
20	56100
21	22440
22	103
23	11538
24	161691
25	746316
26	1488240
27	1338120
28	446040
29	306
30	68427
31	1524969
32	10652086
33	32760180
34	49718640
35	36614760
36	10461360
37	930
38	414294
39	14382720
40	146464740
41	652517010
42	1487453760
43	1816345440
44	1131883200
45	282970800

[1, 1, 2, 2, 12, 12, 5, 64, 162, 108, 13, 354, 1734, 2760, 1380, 36, 1992, 16977, 48716, 56100, 22440, 103, 11538, 161691, 746316, 1488240, 1338120, 446040, 306, 68427, 1524969, 10652086, 32760180, 49718640, 36614760, 10461360, 930, 414294, 14382720, 146464740, 652517010, 1487453760, 1816345440, 1131883200, 282970800]

cp's OEIS Frontend

A339297 Triangle read by rows: T(n,k) is the number of oriented series-parallel networks with n colored elements and without multiple unit elements in parallel using exactly k colors.

Table of values

List of values