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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

Table of n, a(n) for n=1..19.

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

N. J. A. Sloane

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.)