A math major should know how to search the litterature. especially when the references are spelled out.
12 pentominoes and a solved 3x20. Straight out from my obfuscation. 

xxxxx

 x
xxx
 x

xx
x
xx

 XX
XXX

  x
xxx
x

  x
xxxx

xx
 xx
  x

xxx
 x
 x

 x
xxx
x

  xx
xxx

xxxx
   x

  x
  x
xxx



_________________________________________________________
|   __|  |____________|  |__  |___  ___|  |________   |  |
|  |__   ___|    |  _____| |__   |  |  ______|   __|__|  |
|_____|__|_______|__|_________|__|__|__|________|________|

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-- stefp -- check out TeXmacs wiki

In reply to Re: Re: Re: Pentominos Solver by stefp
in thread Pentominos Solver by Lexicon

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