Triangle read by rows: T(n,k) is the number of ways to place k non-attacking kings in each row and column of an n X n board, 0 <= k <= floor(n/4) + [n=1].

A387098

Triangle read by rows: T(n,k) is the number of ways to place k non-attacking kings in each row and column of an n X n board, 0 <= k <= floor(n/4) + [n=1].

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =1a(7) =14a(8) =1a(9) =90a(10) =1a(11) =646a(12) =1a(13) =5242a(14) =2a(15) =1a(16) =47622a(17) =664a(18) =1a(19) =479306a(20) =146510a(21) =1a(22) =5296790a(23) =31197434a(24) =1a(25) =63779034a(26) =6798881226a(27) =2a(28) =1a(29) =831283558

External references