0,4

On a square grid a "toothpick" can be represented as an edge of length 2.

Note that if n > 1 is a power of 2 then a(n) = n^2 - 2n.

Cf. A139250, A139251, A159787, A159788, A159789, A159796.

Sequence in context: A141719 A098352 A014198 this_sequence A083744 A114027 A005877

Adjacent sequences: A159783 A159784 A159785 this_sequence A159787 A159788 A159789

more,nonn

Omar E. Pol (info(AT)polprimos.com), Apr 28 2009