A369776 - cp's OEIS frontend

A369776 Triangular array read by rows. T(n,k) is the number of inequivalent (as defined below) transitive binary relations R on [n] such that |domain(R intersect R^(-1))| = k, n>=0, 0<=k<=n.

n	a(n)
0	1
1	1
2	1
3	3
4	2
5	4
6	19
7	9
8	12
9	29
10	219
11	76
12	72
13	116
14	355
15	4231
16	1095
17	760
18	870
19	1775
20	6942
21	130023
22	25386
23	13140
24	11020
25	15975
26	41652
27	209527
28	6129859
29	910161
30	355404
31	222285
32	236075
33	437346
34	1466689
35	9535241
36	431723379
37	49038872
38	14562576
39	6871144
40	5442150
41	7386288
42	17600268
43	76281928
44	642779354

[1, 1, 1, 3, 2, 4, 19, 9, 12, 29, 219, 76, 72, 116, 355, 4231, 1095, 760, 870, 1775, 6942, 130023, 25386, 13140, 11020, 15975, 41652, 209527, 6129859, 910161, 355404, 222285, 236075, 437346, 1466689, 9535241, 431723379, 49038872, 14562576, 6871144, 5442150, 7386288, 17600268, 76281928, 642779354]

cp's OEIS Frontend

A369776 Triangular array read by rows. T(n,k) is the number of inequivalent (as defined below) transitive binary relations R on [n] such that |domain(R intersect R^(-1))| = k, n>=0, 0<=k<=n.

Table of values

List of values