OFFSET

1,1

COMMENTS

LINKS

David Bevan, The 88 fixed triglasses.

Rebecca M. Bowen, Sadie Pruitt, and Douglas A. Torrance, Properties of regular Tangles, arXiv:2405.20793 [math.CO], 2024. See p. 2.

Adam Gruber, Java program to count lattice animals.

EXAMPLE

a(2) = 12: three rotations of a diamond, three rotations of an hourglass and six rotations of "two mountains".

CROSSREFS

KEYWORD

nonn,more,hard

AUTHOR

David Bevan, Sep 18 2018

EXTENSIONS

a(12) from Aaron N. Siegel, May 22 2022

STATUS

approved