A224720 Number of (n+3) X (n+3) 0..2 matrices with each 4 X 4 subblock idempotent.

2052, 1920, 3092, 3924, 4498, 7090, 11268, 16568, 22726, 32326, 47310, 69124, 98934, 141122, 202398, 291280, 417790, 597382, 853688, 1220732, 1744804, 2491066, 3553342, 5066576, 7221562, 10287590, 14646626, 20842212, 29645776

Offset

1,1

Comments

Diagonal of A224728.

Links

Table of n, a(n) for n=1..29.

Example

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

Crossrefs

Cf. A224728.

Sequence in context: A168176 A224728 A224721 * A320277 A322102 A206068

Adjacent sequences: A224717 A224718 A224719 * A224721 A224722 A224723

Keyword

nonn

Author

R. H. Hardin, Apr 16 2013

Status

approved