A339770 Number of polyfetts (or polifetti) with n cells, distinguishing mirror images.

1, 15, 170, 2766, 46127, 811265, 14605298, 268039329

Offset

1,2

Comments

A polyfett [polifetto] is a generalized polyabolo [polytan]. It is formed by joining isosceles right triangles on the quadrille grid along edges and at corners.

Links

Table of n, a(n) for n=1..8.

George Sicherman, Catalogue of Polyfetts

Example

For n=2 there are 4 diaboloes and 11 proper difetts, distinguishing mirror images.  See the link.

Crossrefs

Cf. A337867 (number of polyfetts with n cells, identifying mirror images).

Sequence in context: A036734 A201041 A201551 * A240276 A206600 A016172

Adjacent sequences: A339767 A339768 A339769 * A339771 A339772 A339773

Keyword

nonn,hard,more

Author

George Sicherman, Dec 16 2020

Status

approved