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Number of pseudo-square parallelogram (psp) polyominoes by semiperimeter.
2

%I #12 Mar 01 2020 20:44:17

%S 1,2,3,6,11,22,45,90,184,370,751,1516,3053,6172,12405,25042,50323,

%T 101424,203880,410296,824871,1658338,3333405,6696814,13457112,

%U 27021758,54278993,108952646,218765704,439001338,881134467

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

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

%H Srecko Brlek, Andrea Frosini, Simone Rinaldi, Laurent Vuillon, <a href="https://doi.org/10.37236/1041">Tilings by translation: enumeration by a rational language approach</a>, The Electronic Journal of Combinatorics, vol.13, (2006).

%Y Cf. A245185.

%K nonn,more

%O 2,2

%A _Joerg Arndt_, Jul 20 2014

%E a(29)-a(32) from _Andrew Howroyd_, Mar 01 2020