Rectangular array A read by upward antidiagonals: A(n,m) is the number of total difunctional (regular) binary relations between an n-element set and an m-element set.

A265706

Rectangular array A read by upward antidiagonals: A(n,m) is the number of total difunctional (regular) binary relations between an n-element set and an m-element set.

Terms

    a(0) =1a(1) =3a(2) =1a(3) =7a(4) =5a(5) =1a(6) =15a(7) =19a(8) =9a(9) =1a(10) =31a(11) =65a(12) =49a(13) =17a(14) =1a(15) =63a(16) =211a(17) =225a(18) =127a(19) =33a(20) =1a(21) =127a(22) =665a(23) =961a(24) =749a(25) =337a(26) =65a(27) =1a(28) =255a(29) =2059

External references