Eight bishops and one elephant on a 3 X 3 chessboard. G.f.: (1 - x - x^2)/(1 - 3*x - x^2 + 6*x^3).

Terms

a(0) =1a(1) =2a(2) =6a(3) =14a(4) =36a(5) =86a(6) =210a(7) =500a(8) =1194a(9) =2822a(10) =6660a(11) =15638a(12) =36642a(13) =85604a(14) =199626a(15) =464630a(16) =1079892a(17) =2506550a(18) =5811762a(19) =13462484a(20) =31159914a(21) =72071654a(22) =166599972a(23) =384912086a(24) =888906306a(25) =2052031172a(26) =4735527306a(27) =10925175254a(28) =25198866036a(29) =58108609526