A360743 - cp's OEIS frontend

A360743 Number of idempotent binary relation matrices E on [n] such that E contains an identity matrix of order n-1 and (E - I_n)^2 = 0.

n	a(n)
0	1
1	2
2	9
3	52
4	435
5	5046
6	81501
7	1823144
8	56572263
9	2435930410
10	145888123953
11	12173595399516
12	1418664206897691
13	231298954644947294
14	52860840028599821445
15	16957903154151836822608
16	7647128139328190245443279
17	4852236755345544324027858258

[1, 2, 9, 52, 435, 5046, 81501, 1823144, 56572263, 2435930410, 145888123953, 12173595399516, 1418664206897691, 231298954644947294, 52860840028599821445, 16957903154151836822608, 7647128139328190245443279, 4852236755345544324027858258]

cp's OEIS Frontend

A360743 Number of idempotent binary relation matrices E on [n] such that E contains an identity matrix of order n-1 and (E - I_n)^2 = 0.

Table of values

List of values