1,6

This sequence enumerates a subset of the polyominoes enumerated by A056878.

Table of n, a(n) for n=1..16.

a(n) = A056878(2*n) - A351159(2*n).

a(4)=1 because of:

O

OOO

Cf. A000105, A056878, A351159.

Sequence in context: A082230 A236547 A078775 * A056392 A080149 A217134

Adjacent sequences: A351157 A351158 A351159 * A351161 A351162 A351163

nonn,more

John Mason, Feb 03 2022

approved