A370203 - cp's OEIS frontend

A370203 Triangular array read by rows. T(n,k) is the number of binary relations on [n] that have exactly k accessible points, n>=0, 0<=k<=n.

n	a(n)
0	1
1	1
2	1
3	3
4	6
5	7
6	25
7	75
8	159
9	253
10	543
11	2172
12	6354
13	17004
14	39463
15	29281
16	146405
17	532130
18	1841650
19	6808765
20	24196201
21	3781503
22	22689018
23	97165485
24	395729820
25	1801073385
26	9917482698
27	56481554827

[1, 1, 1, 3, 6, 7, 25, 75, 159, 253, 543, 2172, 6354, 17004, 39463, 29281, 146405, 532130, 1841650, 6808765, 24196201, 3781503, 22689018, 97165485, 395729820, 1801073385, 9917482698, 56481554827]

cp's OEIS Frontend

A370203 Triangular array read by rows. T(n,k) is the number of binary relations on [n] that have exactly k accessible points, n>=0, 0<=k<=n.

Table of values

List of values