Differences between A147562 (Ulam-Warburton cellular automaton) and A187220 (Gullwing sequence).

Terms

a(0) =0a(1) =0a(2) =2a(3) =2a(4) =6a(5) =2a(6) =6a(7) =2a(8) =14a(9) =2a(10) =6a(11) =2a(12) =14a(13) =2a(14) =6a(15) =-14a(16) =30a(17) =2a(18) =6a(19) =2a(20) =14a(21) =2a(22) =6a(23) =-14a(24) =30a(25) =2a(26) =6a(27) =-14a(28) =22a(29) =-22