89827

Appears in sequences

• Number of ways to build a contiguous building with n LEGO blocks of size 1 X 4 on top of a fixed block of the same size so that the building is flat, i.e., with all blocks in parallel position and symmetric after a rotation by 180 degrees.at n=11A123785
• Composite numbers in A381019 which are immediately followed by another composite number, in order of their appearance.at n=40A379810