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Number of polyhypercubes or 4-dimensional polyominoes with n cells (regarding mirror-images as distinct).
2

%I #14 Oct 19 2017 10:46:18

%S 1,1,1,2,7,27,164,1316,12757,134174,1474341,16588434

%N Number of polyhypercubes or 4-dimensional polyominoes with n cells (regarding mirror-images as distinct).

%D _Don Reble_, Personal communication, Feb 25 2015

%F a(n) = A006760(n) + A006765(n) + A006766(n) + signum(n-1) for n >= 1. - _Sean A. Irvine_, Jul 19 2017

%Y Cf. A049429, A049430, A068870.

%K hard,nonn

%O 0,4

%A _N. J. A. Sloane_, Mar 01 2015