Write 1,2,... in a clockwise spiral; sequence gives numbers on positive x axis.

Terms

a(0) =1a(1) =8a(2) =23a(3) =46a(4) =77a(5) =116a(6) =163a(7) =218a(8) =281a(9) =352a(10) =431a(11) =518a(12) =613a(13) =716a(14) =827a(15) =946a(16) =1073a(17) =1208a(18) =1351a(19) =1502a(20) =1661a(21) =1828a(22) =2003a(23) =2186a(24) =2377a(25) =2576a(26) =2783a(27) =2998a(28) =3221a(29) =3452