Triangle T(n,k) read by rows: number of height-2-restricted finite functions.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =2a(5) =1a(6) =10a(7) =8a(8) =3a(9) =1a(10) =41a(11) =38a(12) =15a(13) =4a(14) =1a(15) =196a(16) =216a(17) =90a(18) =24a(19) =5a(20) =1a(21) =1057a(22) =1402a(23) =633a(24) =172a(25) =35a(26) =6a(27) =1a(28) =6322a(29) =10156