**Henry Robbins**

*polyominoes*(2021)

Netpbm (P1)

__source code__The free polyominoes for n in [1..4] are shown. Each n is shown in binary on the left of the image. Note that the skew-tetromino was accidentally omitted.

Netpbm (P1)

The free polyominoes for n in [1..4] are shown. Each n is shown in binary on the left of the image. Note that the skew-tetromino was accidentally omitted.