A123837
Number of ways to build a contiguous building with n LEGO blocks of size 3 X 3 on top of a fixed block of the same size so that the building is symmetric after a rotation by 90 degrees.
Original entry on oeis.org
1, 1, 1, 4, 7, 10, 13, 61, 154, 256
Offset: 1
A123838
Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 4 X 4.
Original entry on oeis.org
1, 13, 869, 69479, 6131125, 571764366, 55449596876
Offset: 1
A123839
Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 4 X 4 which is symmetric after a rotation by 180 degrees.
Original entry on oeis.org
1, 1, 21, 67, 1565, 6241, 137613, 630193, 13136926
Offset: 1
A123840
Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 4 X 4 which is symmetric after a rotation by 90 degrees.
Original entry on oeis.org
1, 1, 1, 1, 13, 19, 25, 165, 713
Offset: 1
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