Square array A(n,k), n>=1, k>=1, read by antidiagonals: A(n,k) is the number of n-colorings of the complete bipartite graph K_(k,k).

A212085

Square array A(n,k), n>=1, k>=1, read by antidiagonals: A(n,k) is the number of n-colorings of the complete bipartite graph K_(k,k).

Terms

    a(0) =0a(1) =0a(2) =2a(3) =0a(4) =2a(5) =6a(6) =0a(7) =2a(8) =18a(9) =12a(10) =0a(11) =2a(12) =42a(13) =84a(14) =20a(15) =0a(16) =2a(17) =90a(18) =420a(19) =260a(20) =30a(21) =0a(22) =2a(23) =186a(24) =1812a(25) =2420a(26) =630a(27) =42a(28) =0a(29) =2

External references