A156486 Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 27.

5, 158, 6416, 857040, 374246510, 579965060780, 2053848487196544, 15048641280420910920

Offset

3,1

Links

Table of n, a(n) for n=3..10.

Crossrefs

Sequence in context: A369397 A155208 A321529 * A393507 A208170 A088694

Adjacent sequences: A156483 A156484 A156485 * A156487 A156488 A156489

Keyword

nonn

Author

R. H. Hardin, Feb 09 2009

Status

approved