Coordination sequence for octagonal tiling is a(n) + A103908(n)*sqrt(2).

Terms

a(0) =4a(1) =32a(2) =-8a(3) =24a(4) =40a(5) =40a(6) =-176a(7) =444a(8) =240a(9) =-648a(10) =232a(11) =508a(12) =-272a(13) =-556a(14) =1540a(15) =980a(16) =-3064a(17) =1424a(18) =812a(19) =740a(20) =-3284a(21) =2172a(22) =4164a(23) =-8648a(24) =6836a(25) =3164a(26) =-7972a(27) =1500a(28) =4716a(29) =792