A126736 - cp's OEIS frontend

A126736 Triangle read by rows: T(n,k) (n>=2, k=2..n) gives number of connected graphs on n nodes with chromatic number n-k+1.

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	3
6	1
7	3
8	12
9	5
10	1
11	4
12	26
13	64
14	17
15	1
16	5
17	46
18	282
19	475
20	44
21	1
22	6
23	74
24	809
25	5009
26	5036
27	182
28	1
29	7
30	110
31	1940
32	27794
33	149551
34	80947
35	730
36	1
37	8
38	156
39	4125
40	113272
41	1890221
42	7694428
43	2010328
44	4032

[1, 1, 1, 1, 2, 3, 1, 3, 12, 5, 1, 4, 26, 64, 17, 1, 5, 46, 282, 475, 44, 1, 6, 74, 809, 5009, 5036, 182, 1, 7, 110, 1940, 27794, 149551, 80947, 730, 1, 8, 156, 4125, 113272, 1890221, 7694428, 2010328, 4032]

cp's OEIS Frontend

A126736 Triangle read by rows: T(n,k) (n>=2, k=2..n) gives number of connected graphs on n nodes with chromatic number n-k+1.

Table of values

List of values