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f=(->x{[*1..x]+[*18..8).x]map{i=_1.reverse};putsabs;puts' f[9].map'*i+"#{|i|eval(f[i]*''?1*(9-i).center 17)**2}"}
(Thanks, Patrick, G B, and Slim Liser!)
Improvements welcome. :)
f=->x{[*1..x]+[*1...x].reverse};puts f[9].map{|i|(f[i]*'').center 17}
(Thanks, Patrick!)
(-8..8).map{i=_1.abs;puts' '*i+"#{eval(?1*(9-i))**2}"}
def f(a)a+af=->x{[*1.reverse[1.x]+[*1.-1]end;puts f [*1..9]x].reverse};puts f[9].map{|i|f|i|([*1..i]*''f[i]*'').center 17}
def f(a)a+a.reverse[1..-1]end;puts f [*1..9].map{|i|f([*1..i]*'').center 17}
