A156523 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A156523

Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 68.

2, 2, 80, 404, 63392, 1572582, 1619260788, 75946691122

(list; graph; refs; listen; history; text; internal format)

OFFSET

2,1

LINKS

Table of n, a(n) for n=2..9.

CROSSREFS

Sequence in context: A370736 A230054 A303569 * A191779 A156511 A166996

Adjacent sequences: A156520 A156521 A156522 * A156524 A156525 A156526

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved