Solution to Popular Computing Contest 4, the Square Spiral.

Terms

a(0) =1a(1) =5a(2) =14a(3) =30a(4) =54a(5) =84a(6) =123a(7) =168a(8) =220a(9) =277a(10) =343a(11) =416a(12) =495a(13) =583a(14) =675a(15) =777a(16) =0a(17) =1000a(18) =1121a(19) =1252a(20) =1391a(21) =1532a(22) =1683a(23) =1844a(24) =2010a(25) =2183a(26) =2364a(27) =2551a(28) =2743a(29) =2949