The number of ways of seating n people around a table for the second time so that k pairs are maintained. T(n,k) read by rows.

A326390

The number of ways of seating n people around a table for the second time so that k pairs are maintained. T(n,k) read by rows.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =0a(4) =0a(5) =2a(6) =0a(7) =0a(8) =0a(9) =6a(10) =0a(11) =0a(12) =16a(13) =0a(14) =8a(15) =10a(16) =0a(17) =50a(18) =50a(19) =0a(20) =10a(21) =36a(22) =144a(23) =180a(24) =240a(25) =108a(26) =0a(27) =12a(28) =322a(29) =980

External references