A224560 Number of (n+3)X(n+3) 0..1 matrices with each 4X4 subblock idempotent

452, 340, 514, 752, 974, 1550, 2526, 3918, 5716, 8536, 12978, 19670, 29226, 43204, 63992, 94856, 139914, 205488, 301196, 441124, 644948, 940908, 1370156, 1992618, 2894276, 4198330, 6081892, 8800132, 12719614, 18365760

Offset

1,1

Comments

Diagonal of A224568

Links

Table of n, a(n) for n=1..30.

Example

Some solutions for n=3
..1..1..1..1..0..1....0..1..0..0..0..0....0..0..0..0..0..0....1..1..1..1..1..1
..0..0..0..0..0..0....0..1..0..0..0..0....1..1..1..1..1..1....0..0..0..0..0..0
..0..0..0..0..0..0....0..1..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0
..0..0..0..0..0..0....0..1..0..0..0..0....0..0..0..0..0..0....0..0..0..0..0..0
..0..0..0..0..0..0....0..1..0..0..0..1....0..0..0..0..0..0....0..0..0..0..0..0
..0..0..0..0..0..0....0..0..0..0..0..1....1..1..1..1..1..1....0..0..0..1..1..1

Crossrefs

Sequence in context: A345319 A066322 A128922 * A224568 A224561 A116308

Adjacent sequences: A224557 A224558 A224559 * A224561 A224562 A224563

Keyword

nonn

Author

R. H. Hardin Apr 10 2013

Status

approved