|
|
EXAMPLE
|
The set s = {3,4,6,8,9} has set partitions {{3,4,6,8,9}} and {{3,4,8},{6,9}} with equal block-sums, so s is counted under a(9).
The a(3) = 1 through a(6) = 19 subsets:
{1,2,3} {1,2,3} {1,2,3} {1,2,3}
{1,3,4} {1,3,4} {1,3,4}
{1,2,3,4} {1,4,5} {1,4,5}
{2,3,5} {1,5,6}
{1,2,3,4} {2,3,5}
{1,2,4,5} {2,4,6}
{2,3,4,5} {1,2,3,4}
{1,2,3,4,5} {1,2,3,6}
{1,2,4,5}
{1,2,5,6}
{1,3,4,6}
{2,3,4,5}
{2,3,5,6}
{3,4,5,6}
{1,2,3,4,5}
{1,2,3,4,6}
{1,2,4,5,6}
{2,3,4,5,6}
{1,2,3,4,5,6}
|
