A265707 - cp's OEIS frontend

A265707 Rectangular array A read by upward antidiagonals: A(n,m) is the number of surjective difunctional (regular) binary relations between an n-element set and an m-element set.

n	a(n)
1	1
2	1
3	3
4	1
5	5
6	7
7	1
8	9
9	19
10	15
11	1
12	17
13	49
14	65
15	31
16	1
17	33
18	127
19	225
20	211
21	63
22	1
23	65
24	337
25	749
26	961
27	665
28	127
29	1
30	129
31	919
32	2505
33	3991
34	3969
35	2059
36	255
37	1
38	257
39	2569
40	8525
41	16201
42	20237
43	16129
44	6305
45	511
46	1
47	513
48	7327
49	29625
50	65911
51	97713

[1, 1, 3, 1, 5, 7, 1, 9, 19, 15, 1, 17, 49, 65, 31, 1, 33, 127, 225, 211, 63, 1, 65, 337, 749, 961, 665, 127, 1, 129, 919, 2505, 3991, 3969, 2059, 255, 1, 257, 2569, 8525, 16201, 20237, 16129, 6305, 511, 1, 513, 7327, 29625, 65911, 97713]

cp's OEIS Frontend

A265707 Rectangular array A read by upward antidiagonals: A(n,m) is the number of surjective difunctional (regular) binary relations between an n-element set and an m-element set.

Table of values

List of values