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