A393005 Number of fixed polyjogs with n cells.

1, 4, 20, 110, 642, 3892, 24248, 154107, 994676, 6498608, 42880492, 285264740, 1910838742, 12874939616

Offset

1,2

Comments

A polyjog is a polyform composed of n connected unit squares adjoined along half-edges: every pair of adjacent cells shares an edge of length exactly 1/2.

In this sequence, figures that differ by a rotation or reflection are considered distinct.

Links

Table of n, a(n) for n=1..14.

George Sicherman, Catalogue of Polyjogs

Crossrefs

Cf. A354308, A393004, A390622.

Sequence in context: A380684 A006770 A158827 * A263854 A026156 A025183

Adjacent sequences: A393002 A393003 A393004 * A393006 A393007 A393008

Keyword

nonn,more,hard

Author

John Mason, Jan 30 2026

Status

approved