OFFSET
1,2
LINKS
Andrey Zabolotskiy, Table of n, a(n) for n = 1..1000
Matt DeCross, Lattice Polytopes and Orbifolds, 2015.
Matt DeCross, Lattice Polytopes and Orbifolds in Quiver Gauge Theories, 2015. See slides 18-21.
Gus L. W. Hart and Rodney W. Forcade, Algorithm for generating derivative superstructures, Phys. Rev. B 77, 224115 (2008), DOI: 10.1103/PhysRevB.77.224115 [see Table IV].
Materials Simulation Group, Derivative structure enumeration library
PROG
(Python)
# see A159842 for the definition of dc, fin, per, u, N, N2
def a(n): # from DeCross's slides
return (dc(u, N, N2)(n) + 6*dc(fin(1, -1, 0, 4), u, u, N)(n)
+ 3*dc(fin(1, 3), u, u, N)(n)
+ 8*dc(fin(1, 0, -1, 0, 0, 0, 0, 0, 3), u, u, per(0, 1, -1))(n)
+ 6*dc(fin(1, 1), u, u, per(0, 1, 0, -1))(n))//24
print([a(n) for n in range(1, 300)])
# Andrey Zabolotskiy, Sep 02 2019
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrey Zabolotskiy, Mar 12 2018
EXTENSIONS
Terms a(11) and beyond from Andrey Zabolotskiy, Sep 02 2019
STATUS
editing