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  1. or download this
    spiral =: 3 : 0
>: (,~ y.) $ (i. *: y.) i.~ /: ,/ (-@>.&| , -@{:@*.@(1j_1&*)@j.)"0/~ (
+i. y.) - -:<: y.
)
2!:55[0[ 1!:2&2 spiral 5".>{: ARGV
  2. or download this
    spiral =: - ]\ i.@:*: [`]`[} [: \: [: ,/ [: (>.&| , 12&o.@(1j_1&*)@j.)
+"0/~ i. - -:@:<: