A216642 Number of nondecreasing arrays of n 1..n integers with the sum of their 4th powers equal to sum(i^4,i=1..n).

1, 1, 1, 1, 1, 1, 2, 2, 5, 11, 25, 51, 136, 367, 886, 2507, 6986, 20453, 60708, 172073, 524771, 1628140, 5085497

Offset: 1

Author

R. H. Hardin Sep 11 2012

Keywords

• nonn

Comments

Column 4 of A216645

Examples

			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