Triangle read by rows: T(n,k) is the number of endofunctions on [n] whose third-smallest component has size exactly k; n >= 0, 0 <= k <= max(0,n-2).

A350081

Triangle read by rows: T(n,k) is the number of endofunctions on [n] whose third-smallest component has size exactly k; n >= 0, 0 <= k <= max(0,n-2).

Terms

    a(0) =1a(1) =1a(2) =4a(3) =26a(4) =1a(5) =237a(6) =1a(7) =18a(8) =2789a(9) =31a(10) =135a(11) =170a(12) =40270a(13) =386a(14) =810a(15) =3060a(16) =2130a(17) =689450a(18) =6574a(19) =13545a(20) =36295a(21) =44730a(22) =32949a(23) =13657756a(24) =129291a(25) =327285a(26) =323680a(27) =944300a(28) =790776a(29) =604128

External references