Number of squares on infinite half chessboard at <=n knight moves from a fixed point on the edge.

Terms

a(0) =1a(1) =5a(2) =23a(3) =60a(4) =110a(5) =172a(6) =248a(7) =338a(8) =442a(9) =560a(10) =692a(11) =838a(12) =998a(13) =1172a(14) =1360a(15) =1562a(16) =1778a(17) =2008a(18) =2252a(19) =2510a(20) =2782a(21) =3068a(22) =3368a(23) =3682a(24) =4010a(25) =4352a(26) =4708a(27) =5078a(28) =5462a(29) =5860