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- Interactive mode enabled
- php > function f($n){return--$n?f($n)**2-f($n)+1:2;}
- php > var_dump(f(1));
- int(2)
- php > var_dump(f(2));
- int(3)
- php > var_dump(f(3));
- int(7)
- php > var_dump(f(4));
- int(43)
- php > var_dump(f(5));
- int(1807)
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