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

1,7

Comments

Column 4 of A216645

Links

Table of n, a(n) for n=1..23.

Example

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

Crossrefs

Sequence in context: A109278 A367966 A112527 * A227999 A049680 A153983

Adjacent sequences: A216639 A216640 A216641 * A216643 A216644 A216645

Keyword

nonn

Author

R. H. Hardin Sep 11 2012

Status

approved