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Number of ways to choose 2^n vectors in {0, 1, 2, 3}^n such that any two differ by at least 2 in at least one coordinate (2^n being maximal).
0

%I #4 Feb 04 2019 14:14:44

%S 3,79,457645

%N Number of ways to choose 2^n vectors in {0, 1, 2, 3}^n such that any two differ by at least 2 in at least one coordinate (2^n being maximal).

%K nonn,bref,hard

%O 1,1

%A _Jan Kristian Haugland_