Number of n-polyplets (polyominoes connected at edges or corners); may contain holes.

A030222

Number of n-polyplets (polyominoes connected at edges or corners); may contain holes.

Terms

    a(0) =1a(1) =2a(2) =5a(3) =22a(4) =94a(5) =524a(6) =3031a(7) =18770a(8) =118133a(9) =758381a(10) =4915652a(11) =32149296a(12) =211637205a(13) =1401194463a(14) =9321454604a(15) =62272330564a(16) =417546684096

External references