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A255487
Number of polyhypercubes or 4-dimensional polyominoes with n cells (regarding mirror-images as distinct).
2
1, 1, 1, 2, 7, 27, 164, 1316, 12757, 134174, 1474341, 16588434
OFFSET
0,4
REFERENCES
Don Reble, Personal communication, Feb 25 2015
FORMULA
a(n) = A006760(n) + A006765(n) + A006766(n) + signum(n-1) for n >= 1. - Sean A. Irvine, Jul 19 2017
CROSSREFS
KEYWORD
hard,nonn
AUTHOR
N. J. A. Sloane, Mar 01 2015
STATUS
approved