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Search: id:A156432
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A156432 Number of nXn arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 3. +0
1
1, 6, 12, 136, 294, 3924, 9712, 156128, 424980, 8019000, 23622288, 509911008, 1609793976, 39027027088, 131023800192, 3518648357632, 12483723152016, 367381371180384, 1370345745388480, 43811251070582400, 171071079764322144 (list; graph; listen)
OFFSET

3,2
CROSSREFS

Sequence in context: A102077 A102062 A164584 this_sequence A070020 A002922 A014402

Adjacent sequences: A156429 A156430 A156431 this_sequence A156433 A156434 A156435

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Feb 09 2009

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Last modified December 3 22:15 EST 2009. Contains 170310 sequences.

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