A156499 Number of n X n arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to 36.

1, 0, 0, 7, 15, 150, 1830, 136182, 3730237, 747469740, 63910429200

Offset

1,4

Links

Table of n, a(n) for n=1..11.

Crossrefs

Sequence in context: A032018 A243470 A068366 * A137881 A042725 A041096

Adjacent sequences: A156496 A156497 A156498 * A156500 A156501 A156502

Keyword

nonn

Author

R. H. Hardin Feb 09 2009

Status

approved