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Pentomino Solutions
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Not counting rotations and reflections, for the 3x20, there are but two solutions, the other one derived from the one shown by rotating the section outlined in white by 180 degrees.

To see "I"- or "+"- based breakdowns, click on the P-pentominoes:
(some placements have unique solutions !)

the 2339 solutions of the 6x10

the 1010 solutions of the 5x12

the 368 solutions of the 4x15

congruent halves of the 6x10's

to refresh the sample solutions
of all four standard size puzzles.