Answer to Red, Green and Blue Tiles Problem.

Terms

a(0) =0a(1) =0a(2) =1a(3) =4a(4) =11a(5) =23a(6) =43a(7) =75a(8) =126a(9) =207a(10) =335a(11) =536a(12) =852a(13) =1350a(14) =2136a(15) =3378a(16) =5344a(17) =8462a(18) =13416a(19) =21300a(20) =33866a(21) =53923a(22) =85979a(23) =137274a(24) =219444a(25) =351203a(26) =562667a(27) =902327a(28) =1448298a(29) =2326472