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 A094165 Number of rooted 2-dimensional polyominoes with n hexagonal cells, with no symmetries removed. 2
 1, 6, 33, 176, 930, 4884, 25564, 133512, 696231, 3626710, 18876363, 98186556, 510472118, 2652899130, 13782560610, 71585293504, 371724613716, 1929911381586, 10018066789546, 51996091023360, 269839578888159, 1400217128810676 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 REFERENCES Dan Hoey, Bill Gosper and Richard C. Schroeppel, Discussions in Math-Fun Mailing list, circa Jul 13 1999. LINKS Jean-François Alcover, Table of n, a(n) for n = 1..35 R. C. Schroeppel, A few mathematical experiments, Experimental Mathematics Workshop, Oakland, 2004. FORMULA a(n) = n * A001207(n). - Andrew Howroyd, Dec 04 2018 MATHEMATICA A001207 = Cases[Import["https://oeis.org/A001207/b001207.txt", "Table"], {_, _}][[All, 2]]; a[n_] := n * A001207[[n]]; Array[a, 22] (* Jean-François Alcover, Sep 08 2019 *) CROSSREFS A row of A094166. Cf. A001207. Sequence in context: A081893 A106850 A284076 * A111994 A092851 A137627 Adjacent sequences: A094162 A094163 A094164 * A094166 A094167 A094168 KEYWORD nonn AUTHOR N. J. A. Sloane, May 07 2004 STATUS approved

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Last modified August 11 05:51 EDT 2024. Contains 375059 sequences. (Running on oeis4.)