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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. 0

%I #10 Dec 01 2021 01:10:55

%S 1,1,1,1,13,19,25,165,713

%N 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.

%Y Cf. A112389, A123762 - A123827, A123829 - A123849.

%K nonn,more

%O 1,5

%A _Søren Eilers_, Oct 29 2006

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)