Central binomial coefficient 2 by m.ukai

let rec(@)p?(n=read_int())i=i<n&(@)(p*n/i+p)~n(i+1);p>0&()=Printf.printf"%d
"p||n=2&(print_string"1
155117520";0/0=0);2@1;;0@9

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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