A156454 Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 11.

2, 22, 48, 1568, 9108, 459944, 3924896, 332810880, 3867308971, 659368209568, 11298978667872, 4499416656998240

Offset

3,1

Links

Table of n, a(n) for n=3..14.

Crossrefs

Sequence in context: A306969 A200946 A322157 * A168669 A271883 A152995

Adjacent sequences: A156451 A156452 A156453 * A156455 A156456 A156457

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved