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A244521
Number of pseudo-square parallelogram (psp) polyominoes by semiperimeter.
2
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
2,2
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.
Sequence in context: A354208 A007477 A274936 * A096202 A036653 A318031
KEYWORD
nonn,more
AUTHOR
Joerg Arndt, Jul 20 2014
EXTENSIONS
a(29)-a(32) from Andrew Howroyd, Mar 01 2020
STATUS
approved