A220778 Number of tilings of an n X n square using integer-sided rectangular tiles of equal area.

1, 1, 4, 4, 49, 4, 7104, 4, 13036591, 37201, 258619377111, 4, 53060638473837524, 4, 112202211800073777695003, 67433402020431

Offset

0,3

Comments

a(p) = 4 for prime p.

Links

Table of n, a(n) for n=0..15.

Example

a(3) = 4:
._____.  ._____.  ._____.  ._____.
|     |  | | | |  |_____|  |_|_|_|
|     |  | | | |  |_____|  |_|_|_|
|_____|  |_|_|_|  |_____|  |_|_|_|

Crossrefs

Main diagonal of A220777.

Sequence in context: A027501 A341108 A189102 * A364763 A367891 A322099

Adjacent sequences: A220775 A220776 A220777 * A220779 A220780 A220781

Keyword

nonn,more

Author

Alois P. Heinz, Dec 19 2012

Status

approved