Snake and coil (Hugo Pfoertner)	Discuss about this problem
find big holes in hypercube-graphs of size 2^n A000937 2,4,6,8,14,26,48 Length of longest simple cycle without chords in the n-dimensional hypercube graph. A099155 1,2,4,7,13,26,50 same as A000937 but paths instead of cycles Please send us a simpler description.