1. Polyominoes
2. Extremal animals;Harary F;J Combin Inform System Sci,1976
3. OEIS Foundation Inc. The o-line encyclopedia of integer sequences. Sequence A027709. 2022. Available from: https://oeis.org/A027709
4. Counting polyominoes with minimum perimeter;Kurz S.;Ars Combin,2008
5. OEIS Foundation Inc. The on-line encyclopedia of integer sequences. Sequence A100092. 2022. Available from: https://oeis.org/A100092