Number of fixed n-polyominoids, allowing right-angled connections only ("hard" polyominoids).

A365655

Number of fixed n-polyominoids, allowing right-angled connections only ("hard" polyominoids).

Terms

    a(0) =3a(1) =12a(2) =68a(3) =438a(4) =3054a(5) =22417a(6) =170610a(7) =1334316a(8) =10660143a(9) =86630520a(10) =713883927a(11) =5951389950a(12) =50103049449a(13) =425356416618

External references