White to move: King, Knight and Bishop vs. King: Number of positions with mate in n.

Terms

a(0) =1840a(1) =1200a(2) =3216a(3) =15960a(4) =39752a(5) =45192a(6) =48396a(7) =40408a(8) =42720a(9) =56240a(10) =95208a(11) =142084a(12) =189592a(13) =190296a(14) =139684a(15) =118004a(16) =114200a(17) =119780a(18) =127480a(19) =216552a(20) =350136a(21) =484868a(22) =576832a(23) =584456a(24) =729040a(25) =949808a(26) =1278384a(27) =1531500a(28) =1434268a(29) =859400