A204395 Number of (n+2)X7 0..1 arrays with no 3X3 subblock having three equal diagonal elements or three equal antidiagonal elements, and new values 0..1 introduced in row major order.

61336, 1131008, 19698336, 313801352, 5406738528, 91301191200, 1536831498888, 26029238052168, 439829118347696, 7431287377932800, 125613328165459808, 2122853433439980672, 35877461084178660960, 606366376120718137800

Offset

1,1

Comments

Column 5 of A204398

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Sequence in context: A237461 A215599 A330508 * A181261 A237013 A340438

Adjacent sequences: A204392 A204393 A204394 * A204396 A204397 A204398

Keyword

nonn

Author

R. H. Hardin, Jan 15 2012

Status

approved