A244521 Number of pseudo-square parallelogram (psp) polyominoes by semiperimeter.

1, 2, 3, 6, 11, 22, 45, 90, 184, 370, 751, 1516, 3053, 6172, 12405, 25042, 50323, 101424, 203880, 410296, 824871, 1658338, 3333405, 6696814, 13457112, 27021758, 54278993, 108952646, 218765704, 439001338, 881134467

Offset: 2

Author

Joerg Arndt, Jul 20 2014

Keywords

• nonn
• more

Comments

Terms taken from p. 13 of the Brlek et al. reference.

Links

• Srecko Brlek, Andrea Frosini, Simone Rinaldi, Laurent Vuillon, Tilings by translation: enumeration by a rational language approach, The Electronic Journal of Combinatorics, vol.13, (2006).

Crossrefs

Cf. A245185.

Extensions

a(29)-a(32) from Andrew Howroyd, Mar 01 2020