A polyknight is a variant of a polyomino in which two tiles a knight's move apart are considered adjacent. A polyknight need not be connected in the sense of a polyomino.
These are free polyknights.
Table of n, a(n) for n=1..13.
John Mason, Illustrations
Cf. A030445, A030444, A030447, A030448.
Sequence in context: A087631 A167579 A357095 * A093989 A357037 A356460
Adjacent sequences: A030443 A030444 A030445 * A030447 A030448 A030449
David W. Wilson
Corrected and extended by Joseph Myers, May 21 2004
a(12)-a(13) from John Mason, Jan 13 2023