0,1

Table of n, a(n) for n=0..104.

We assume 1,2,3,5 have no hole; 0,4,6,9 have 1 hole; 8 has two holes. So cutting 8 from a piece of paper creates three connected components: one for each hole and one for the remainder of the paper. Hence a(8)=3.

Cf. A064531. Equals A064692 + 1.

Sequence in context: A082069 A136755 A156775 * A325614 A319608 A230850

Adjacent sequences: A064690 A064691 A064692 * A064694 A064695 A064696

base,easy,nonn

Matthew Conroy, Oct 11 2001

approved