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A337867 Number of polyfetts (or polifetti) with n cells, identifying mirror images. 2


%S 1,10,90,1414,23136,406093,7303813,134027098

%N Number of polyfetts (or polifetti) with n cells, identifying mirror images.

%C A polyfett is a generalized polyabolo (or polytan). Its cells are equal isosceles right triangles on the quadrille grid, which may be joined along equal edges or at vertices.

%C Polyfetts are to polyaboloes what polyplets (or polykings) are to polyominoes.

%H Sean A. Irvine, <a href="https://github.com/archmageirvine/joeis/blob/master/src/irvine/oeis/a337/A337867.java">Java program</a> (github)

%H George Sicherman, <a href="https://userpages.monmouth.com/~colonel/polyfetts/index.html">Catalogue of Polyfetts</a>

%H George Sicherman, <a href="/A337867/a337867_1.c.txt">polyaboloes.c</a>

%e For n = 2, a(2) = 10. Two polyabolo cells can be joined at edges to form 3 different diaboloes, or at corners to form 7 different proper difetts.

%o See link to Unix C program polyaboloes.c under LINKS.

%Y Cf. A006074.

%K nonn,hard,more

%O 1,2

%A _George Sicherman_, Sep 27 2020

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Last modified January 22 02:46 EST 2022. Contains 350481 sequences. (Running on oeis4.)