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A216641 Number of nondecreasing arrays of n 1..n integers with the sum of their 3rd powers equal to sum(i^3,i=1..n) 0
1, 1, 1, 1, 1, 2, 2, 6, 12, 30, 76, 224, 597, 1801, 5469, 16958, 53308, 169872, 548344, 1791949, 5915441, 19700851, 66148464, 223751776, 761919971, 2610778118, 8998428171, 31179152130, 108577507149, 379879051198 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

COMMENTS

Column 3 of A216645

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

All solutions for n=8

..1....3....1....2....2....1

..1....4....2....2....2....2

..4....5....2....2....4....3

..5....6....5....3....4....4

..5....6....5....6....4....5

..5....6....7....7....4....6

..7....6....7....7....8....7

..8....6....7....7....8....8

CROSSREFS

Sequence in context: A027375 A059727 A103872 * A191970 A175516 A244656

Adjacent sequences:  A216638 A216639 A216640 * A216642 A216643 A216644

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 11 2012

STATUS

approved

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Last modified June 18 11:09 EDT 2018. Contains 305554 sequences. (Running on oeis4.)