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1,7
Column 4 of A216645
Table of n, a(n) for n=1..23.
All solutions for n=9
..3....1....1....1....1
..3....3....2....1....1
..4....3....3....2....1
..5....5....4....2....2
..6....6....5....4....5
..7....6....6....5....7
..7....6....7....6....8
..8....8....8....9....8
..8....9....9....9....8
Sequence in context: A078405 A109278 A112527 * A227999 A049680 A153983
Adjacent sequences: A216639 A216640 A216641 * A216643 A216644 A216645
nonn
R. H. Hardin Sep 11 2012
approved