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

2,2

Comments

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

Links

Table of n, a(n) for n=2..32.

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

Adjacent sequences: A244518 A244519 A244520 * A244522 A244523 A244524

Keyword

nonn,more

Author

Joerg Arndt, Jul 20 2014

Extensions

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

Status

approved