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A216640 Number of nondecreasing arrays of n 1..n integers with the sum of their 2nd powers equal to sum(i^2,i=1..n) 1
1, 1, 1, 1, 1, 3, 8, 25, 83, 257, 788, 2491, 7885, 25099, 80481, 264505, 884517, 2994535, 10208806, 35095825, 121699761, 424273761, 1487693075, 5244197347, 18584820912, 66169376686, 236592018517, 849466213882, 3061492852986, 11072927827447 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

COMMENTS

Column 2 of A216645

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..49

EXAMPLE

All solutions for n=6

..1....3....1

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

..3....4....1

..4....4....4

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

..6....5....6

CROSSREFS

Sequence in context: A161634 A293385 A258466 * A148794 A143330 A148795

Adjacent sequences:  A216637 A216638 A216639 * A216641 A216642 A216643

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 11 2012

STATUS

approved

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Last modified January 22 19:16 EST 2020. Contains 331153 sequences. (Running on oeis4.)