Irregular triangle read by rows: T(n,k) is the number of endofunctions on [n] whose third-largest component has size exactly k; n >= 0, 0 <= k <= floor(n/3).
A350080
Irregular triangle read by rows: T(n,k) is the number of endofunctions on [n] whose third-largest component has size exactly k; n >= 0, 0 <= k <= floor(n/3).
Terms
- a(0) =1a(1) =1a(2) =4a(3) =26a(4) =1a(5) =237a(6) =19a(7) =2789a(8) =336a(9) =40270a(10) =5981a(11) =405a(12) =689450a(13) =115193a(14) =18900a(15) =13657756a(16) =2459955a(17) =659505a(18) =307348641a(19) =58366045a(20) =20330163a(21) =1375640a(22) =7745565616a(23) =1530739594a(24) =623758590a(25) =99936200a(26) =216114310994a(27) =44076571672a(28) =19795671225a(29) =5325116720
External references
- oeis: A350080