Array read by antidiagonals: T(m,n) is the number of (undirected) paths in the rook graph K_m X K_n.

A360877

Array read by antidiagonals: T(m,n) is the number of (undirected) paths in the rook graph K_m X K_n.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =6a(4) =12a(5) =6a(6) =30a(7) =129a(8) =129a(9) =30a(10) =160a(11) =1984a(12) =4536a(13) =1984a(14) =160a(15) =975a(16) =45945a(17) =310542a(18) =310542a(19) =45945a(20) =975a(21) =6846a(22) =1524156a(23) =38298270a(24) =111933456a(25) =38298270a(26) =1524156a(27) =6846

External references