Eight bishops and one elephant on a 3 X 3 chessboard. a(n) = 2^(n+2) - 3*F(n+2).

Terms

a(0) =1a(1) =2a(2) =7a(3) =17a(4) =40a(5) =89a(6) =193a(7) =410a(8) =859a(9) =1781a(10) =3664a(11) =7493a(12) =15253a(13) =30938a(14) =62575a(15) =126281a(16) =254392a(17) =511745a(18) =1028281a(19) =2064314a(20) =4141171a(21) =8302637a(22) =16638112a(23) =33329357a(24) =66744685a(25) =133628474a(26) =267482023a(27) =535328225a(28) =1071245704a(29) =2143444841