L[0,L0_:1,___]:=L0 L[1,L0_:1,L1_:1,___]:=L1 L[n_,L0_:1,L1_:1,add_:1]:=L[n-1,L0,L1,add]+L[n-2,L0,L1,add]+add L/@(Range[25]-1) L[#,0,1,0]&/@(Range[25]-1)