A245517 - cp's OEIS frontend

A245517 Irregular triangle read by rows: T(n,L) = number of alpha-labeled graphs with n edges and boundary value L that do not use one number from (1,2,...,n-1) as a label (n >= 4, 1 <= L <= n - 2).

n	a(n)
4	1
5	1
6	4
7	4
8	4
9	12
10	20
11	20
12	12
13	32
14	88
15	96
16	88
17	32
18	80
19	352
20	504
21	504
22	352
23	80
24	192
25	1328
26	2592
27	2880
28	2592
29	1328
30	192
31	448
32	4816
33	12852
34	17280
35	17280
36	12852
37	4816
38	448

[1, 1, 4, 4, 4, 12, 20, 20, 12, 32, 88, 96, 88, 32, 80, 352, 504, 504, 352, 80, 192, 1328, 2592, 2880, 2592, 1328, 192, 448, 4816, 12852, 17280, 17280, 12852, 4816, 448]

cp's OEIS Frontend

A245517 Irregular triangle read by rows: T(n,L) = number of alpha-labeled graphs with n edges and boundary value L that do not use one number from (1,2,...,n-1) as a label (n >= 4, 1 <= L <= n - 2).

Table of values

List of values