A156427 Number of 19 X 19 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n.

1, 168992, 5552479800, 12483723152016, 12976446818207108, 1865501254974930048

Offset

0,2

Links

Table of n, a(n) for n=0..5.

Crossrefs

Sequence in context: A186550 A151618 A156426 * A185474 A034211 A308635

Adjacent sequences: A156424 A156425 A156426 * A156428 A156429 A156430

Keyword

nonn

Author

R. H. Hardin, Feb 09 2009

Status

approved