Triangle read by rows: T(n,k) is the coefficient of x^(2*k) in the cycle polynomial of the complete bipartite graph K_{n,n}, 1 <= k <= n.
A291909
Triangle read by rows: T(n,k) is the coefficient of x^(2*k) in the cycle polynomial of the complete bipartite graph K_{n,n}, 1 <= k <= n.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =0a(4) =9a(5) =6a(6) =0a(7) =36a(8) =96a(9) =72a(10) =0a(11) =100a(12) =600a(13) =1800a(14) =1440a(15) =0a(16) =225a(17) =2400a(18) =16200a(19) =51840a(20) =43200a(21) =0a(22) =441a(23) =7350a(24) =88200a(25) =635040a(26) =2116800a(27) =1814400a(28) =0a(29) =784
External references
- oeis: A291909