Squares on infinite chessboard at n moves from center using a {2,3} fairy knight.

Terms

a(0) =1a(1) =8a(2) =32a(3) =88a(4) =192a(5) =304a(6) =372a(7) =416a(8) =472a(9) =540a(10) =608a(11) =676a(12) =744a(13) =812a(14) =880a(15) =948a(16) =1016a(17) =1084a(18) =1152a(19) =1220a(20) =1288a(21) =1356a(22) =1424a(23) =1492a(24) =1560a(25) =1628a(26) =1696a(27) =1764a(28) =1832a(29) =1900