A224580 Number of (n+6)X(n+6) 0..1 matrices with each 7X7 subblock idempotent

2185738, 26918, 21966, 26528, 31062, 34588, 37202, 39188, 51306, 73564, 103876, 140148, 180814, 224838, 271582, 333314, 421494, 545192, 711240, 924840, 1190134, 1510622, 1904402

Offset

1,1

Comments

Diagonal of A224588

Links

Table of n, a(n) for n=1..23.

Example

Some solutions for n=2
..1..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0....1..1..0..0..0..0..0..0
..0..0..0..0..0..0..0..0....1..0..1..0..0..0..0..0....0..0..0..0..0..0..0..0
..0..0..0..0..0..0..0..1....1..0..1..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..1..1..1..0..0..0
..0..0..0..0..0..0..0..0....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....1..0..1..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..1..1..1..0..0..0

Crossrefs

Sequence in context: A105711 A250491 A348032 * A224581 A224588 A234332

Adjacent sequences: A224577 A224578 A224579 * A224581 A224582 A224583

Keyword

nonn

Author

R. H. Hardin Apr 11 2013

Status

approved