1,1

Table of n, a(n) for n=1..58.

a(2)=11 because 6 unit faces are required to construct each cube but 1 face is shared. I.e., a(2)=6+5=11.

Cf. A117227.

Sequence in context: A315447 A315448 A315449 * A315450 A315451 A072353

Adjacent sequences: A118656 A118657 A118658 * A118660 A118661 A118662

easy,nonn

Ron R. King, May 18 2006

approved