A204395 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

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

(list; graph; refs; listen; history; text; internal format)

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