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

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

Offset: 1

Author

George Sicherman, Sep 27 2020

Keywords

• nonn
• hard
• more

Comments

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.

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

Examples

			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.
		

Links

• Sean A. Irvine, Java program (github)
• George Sicherman, Catalogue of Polyfetts
• George Sicherman, polyaboloes.c

Crossrefs

Cf. A006074.

Programs

C

/* See link to Unix C program polyaboloes.c under LINKS. */