Triangle read by rows: T(n,k) is the number of relations from an n-element set to a k-element set that are not functions.

A344112

Triangle read by rows: T(n,k) is the number of relations from an n-element set to a k-element set that are not functions.

Terms

    a(0) =1a(1) =3a(2) =12a(3) =7a(4) =56a(5) =485a(6) =15a(7) =240a(8) =4015a(9) =65280a(10) =31a(11) =992a(12) =32525a(13) =1047552a(14) =33551307a(15) =63a(16) =4032a(17) =261415a(18) =16773120a(19) =1073726199a(20) =68719430080a(21) =127a(22) =16256a(23) =2094965a(24) =268419072a(25) =34359660243a(28) =255a(29) =65280a(30) =16770655a(31) =4294901760

External references