Triangular array read by rows. T(n,k) is the number of idempotent Boolean relation matrices on [n] with exactly k reflexive points, n >= 0, 0 <= k <= n.

A360984

Triangular array read by rows. T(n,k) is the number of idempotent Boolean relation matrices on [n] with exactly k reflexive points, n >= 0, 0 <= k <= n.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =6a(5) =4a(6) =1a(7) =27a(8) =66a(9) =29a(10) =1a(11) =108a(12) =780a(13) =1116a(14) =355a(15) =1a(16) =405a(17) =8020a(18) =29250a(19) =28405a(20) =6942a(21) =1a(22) =1458a(23) =76110a(24) =649260a(25) =1460425a(26) =1068576a(27) =209527

External references