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Number of independent subsets of nodes of 4^n cube (P_4 X ... X P_4).
2

%I #7 Nov 19 2019 05:56:19

%S 2,8,1234,121039421240

%N Number of independent subsets of nodes of 4^n cube (P_4 X ... X P_4).

%Y Cf. A027624 (P_2), A027667 (P_3).

%K nonn,hard,more

%O 0,1

%A _R. H. Hardin_

%E a(0) corrected by _Sean A. Irvine_, Nov 16 2019