Number of ways to place 5 nonattacking zebras on a 5 X n board.

Terms

a(0) =1a(1) =252a(2) =1925a(3) =6534a(4) =20502a(5) =57710a(6) =142312a(7) =308254a(8) =606051a(9) =1105332a(10) =1897899a(11) =3100250a(12) =4857000a(13) =7344010a(14) =10771530a(15) =15387310a(16) =21479725a(17) =29380900a(18) =39469835a(19) =52175530a(20) =67980110a(21) =87421950a(22) =111098800a(23) =139670910a(24) =173864155