Coordination sequence for octagonal tiling is a(n)*sqrt(2) + A103909(n).

Terms

a(0) =0a(1) =16a(2) =16a(3) =4a(4) =12a(5) =8a(6) =148a(7) =288a(8) =140a(9) =492a(10) =128a(11) =320a(12) =236a(13) =440a(14) =-1040a(15) =-640a(16) =2224a(17) =-948a(18) =-512a(19) =-456a(20) =2392a(21) =-1464a(22) =-2868a(23) =6196a(24) =-4752a(25) =-2152a(26) =5728a(27) =-968a(28) =-3240a(29) =-460