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

Terms

a(0) =1a(1) =12a(2) =143a(3) =770a(4) =3368a(5) =12632a(6) =38566a(7) =98968a(8) =222351a(9) =450682a(10) =843169a(11) =1479116a(12) =2460912a(13) =3917228a(14) =6006056a(15) =8917888a(16) =12878847a(17) =18153806a(18) =25049515a(19) =33917724a(20) =45158308a(21) =59222392a(22) =76615476a(23) =97900560a(24) =123701269a(25) =154704978a(26) =191665937a(27) =235408396a(28) =286829730a(29) =346903564