1 polyominos of size 1 * 1 polyominos of size 2 * * 2 polyominos of size 3 * * * * ** 5 polyominos of size 4 * * * * * * * ** ** ** * ** * ** * 12 polyominos of size 5 * * * * * * * * * ** * * ** * ** * * * * ** ** * * *** * *** ** *** *** * ** * ** ** *** * * * * * * 6 polyominos of size 6 * * * * * ** * * * * * * *** *** *** **** *** * * * * * * * 5 polyominos of size 7 * * * * * *** * * * * * *** **** **** ***** * * * * * * 1 polyominos of size 8 * * ***** * 1 polyominos of size 9 * * ***** * * 0 polyominos of size 10 Total 3-indecomposible polyominos = 34 Size >= 3 3-indecomposible polyominos = 32 Size >= 6 3-indecomposible polyominos = 13