%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