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 A006763 Number of fixed properly-3-dimensional polyominoes with n cells. (Formerly M5232) 2
 0, 0, 0, 32, 348, 2836, 21225, 154741, 1123143, 8185403, 60088748, 444688325, 3317057654, 24925158492, 188543716451, 1434760675947, 10976610064899, 84379534826376, 651441493579872 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 REFERENCES N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS W. F. Lunnon, Counting multidimensional polyominoes. Computer Journal 18 (1975), no. 4, pp. 366-367. FORMULA a(n) = A001931(n) - 3 * (A001168(n) - 1) for n > 1. - Sean A. Irvine, Jul 27 2017 MATHEMATICA A001931 = Cases[Import["https://oeis.org/A001931/b001931.txt", "Table"], {_, _}][[All, 2]]; A001168 = Cases[Import["https://oeis.org/A001168/b001168.txt", "Table"], {_, _}][[All, 2]]; a[n_] := If[n == 1, 0, A001931[[n]] - 3 (A001168[[n]] - 1)]; a /@ Range[1, 19] (* Jean-François Alcover, Sep 22 2019 *) CROSSREFS A column of A195739. Sequence in context: A009797 A240293 A254953 * A158074 A200531 A302320 Adjacent sequences:  A006760 A006761 A006762 * A006764 A006765 A006766 KEYWORD nonn,more AUTHOR EXTENSIONS More terms from Jean-François Alcover, Sep 22 2019 STATUS approved

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Last modified October 14 00:10 EDT 2019. Contains 327990 sequences. (Running on oeis4.)