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UPCOMING CHALLENGES:
CURRENT CHALLENGES:
Neon 2014
PAST CHALLENGES
Fluorum 2014
Oxygenium 2014
Nitrogenium 2013
Carbo 2013
Boron 2013
Beryllium 2013
Lithium 2013
Helium 2013
Hydrogenium 2013
Omega 2013
Psi 2012
Chi 2012
Phi 2012
Upsilon 2012
Tau 2012
Sigma 2012
Rho 2012
Pi 2012
Omicron 2012
Xi 2012
Nu 2011
Mu 2011
Lambda 2011
Kappa 2011
Iota 2011
Theta 2011
Eta 2011
Zeta 2011
Epsilon 2011
Delta 2011
Gamma 2011
December 2010
PrefixSet edition (2010-10)
Phi 2012
Start date: Aug. 14, 2012, 8 p.m. UTC
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Count tilings of a narrow but long rectangle with tiles of size 1x1 or 2x2.
Stats:
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