A389193 Number of fixed polyominoes of area n with holes.

0, 0, 0, 0, 0, 0, 4, 41, 272, 1516, 7708, 37024, 171188, 770552, 3400792, 14787246, 63558507, 270697012, 1144428004, 4809192667, 20108709174, 83729183824, 347400400426, 1437044467826, 5928985417653, 24406875399450, 100274698063644, 411266454694169, 1684212657164903

Offset

1,7

Links

Table of n, a(n) for n=1..29.

Formula

a(n) = A001168(n) - A006724(n).

Crossrefs

Cf. A001168, A001419, A006724, A057419, A389190, A389191.

Sequence in context: A069616 A231653 A057419 * A089664 A121671 A089454

Adjacent sequences: A389190 A389191 A389192 * A389194 A389195 A389196

Keyword

nonn

Author

John Mason, Sep 25 2025

Status

approved