Rectangular array T(n,m), read by upward antidiagonals: T(n,m) is the number of difunctional (regular) binary relations between an n-element set and an m-element set.
A265417
Rectangular array T(n,m), read by upward antidiagonals: T(n,m) is the number of difunctional (regular) binary relations between an n-element set and an m-element set.
Terms
- a(0) =2a(1) =4a(2) =4a(3) =8a(4) =12a(5) =8a(6) =16a(7) =34a(8) =34a(9) =16a(10) =32a(11) =96a(12) =128a(13) =96a(14) =32a(15) =64a(16) =274a(17) =466a(18) =466a(19) =274a(20) =64a(21) =128a(22) =792a(23) =1688a(24) =2100a(25) =1688a(26) =792a(27) =128a(28) =256a(29) =2314
External references
- oeis: A265417