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A216630

Number of nondecreasing arrays of n 0..n-1 integers with the sum of their 2nd powers equal to sum(i^2,i=0..n-1).

1, 1, 1, 1, 2, 4, 14, 37, 105, 309, 939, 2903, 8865, 28163, 90648, 297615, 989077, 3320885, 11280835, 38583017, 133018026, 461630411, 1612842357, 5667628973, 20019876401, 71078302590, 253504107762, 908014000543, 3265037780657

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OFFSET

1,5

COMMENTS

Column 2 of A216635

LINKS

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

EXAMPLE

All solutions for n=6

..0....0....1....2

..1....0....2....2

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

..3....2....3....3

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

..5....5....4....5

CROSSREFS

Sequence in context: A263739 A333892 A135960 * A006611 A007462 A053623

Adjacent sequences: A216627 A216628 A216629 * A216631 A216632 A216633

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 11 2012

STATUS

approved

URL: https://oeis.org/A216630

⇱ A216630 - OEIS