A156423 Number of 17 X 17 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n.

1, 32400, 221921280, 131023800192, 38710991748930, 1839487795001024, 71091010320744928, 681286019507189376

Offset

0,2

Links

Table of n, a(n) for n=0..7.

Crossrefs

Sequence in context: A190471 A236994 A156421 * A236656 A031639 A233680

Adjacent sequences: A156420 A156421 A156422 * A156424 A156425 A156426

Keyword

nonn

Author

R. H. Hardin, Feb 09 2009

Status

approved