Triangle read by rows: number of generic n-rook placements with k rooks below the main diagonal.

A269744

Triangle read by rows: number of generic n-rook placements with k rooks below the main diagonal.

Terms

    a(0) =1a(1) =4a(2) =7a(3) =26a(4) =68a(5) =75a(6) =236a(7) =940a(8) =1090a(9) =1105a(10) =2752a(11) =16645a(12) =20360a(13) =20790a(14) =20821a(15) =39208a(16) =360081a(17) =464111a(18) =477242a(19) =478376a(20) =478439a(21) =660032a(22) =9202170a(23) =12492277a(24) =12933423a(25) =12974826a(26) =12977688a(27) =12977815

External references