Triangle T(n,k) (n >= 2, k = 3..n+floor(n/2)) giving number of bicoverings of an n-set with k blocks.

A059443

Triangle T(n,k) (n >= 2, k = 3..n+floor(n/2)) giving number of bicoverings of an n-set with k blocks.

Terms

    a(0) =1a(1) =4a(2) =4a(3) =13a(4) =39a(5) =25a(6) =3a(7) =40a(8) =280a(9) =472a(10) =256a(11) =40a(12) =121a(13) =1815a(14) =6185a(15) =7255a(16) =3306a(17) =535a(18) =15a(19) =364a(20) =11284a(21) =70700a(22) =149660a(23) =131876a(24) =51640a(25) =8456a(26) =420a(27) =1093a(28) =68859a(29) =759045

External references