1,1
Column 7 of A200831
Table of n, a(n) for n=1..5.
Some solutions for n=3
..0..0..0..0..0..2..1....0..0..0..0..1..2..1....0..0..0..0..0..1..1
..0..0..0..0..3..3..4....0..0..0..0..1..2..2....0..0..0..0..0..3..3
..0..0..0..0..3..5..4....0..0..0..0..2..5..2....0..0..0..0..3..5..4
Sequence in context: A172731 A112665 A092726 * A215365 A028545 A173943
Adjacent sequences: A200827 A200828 A200829 * A200831 A200832 A200833
nonn
R. H. Hardin Nov 23 2011
approved