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A252447 T(n,k)=Number of (n+2)X(k+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum less than 3 7
339, 1677, 1677, 9062, 13777, 9062, 48658, 131202, 131202, 48658, 259257, 1149386, 2091042, 1149386, 259257, 1382414, 10157387, 30491181, 30491181, 10157387, 1382414, 7389034, 91120655, 454665875, 732217984, 454665875, 91120655, 7389034 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Table starts
.......339........1677...........9062............48658..............259257
......1677.......13777.........131202..........1149386............10157387
......9062......131202........2091042.........30491181...........454665875
.....48658.....1149386.......30491181........732217984.........17918363933
....259257....10157387......454665875......17918363933........727114790171
...1382414....91120655.....6833055569.....443610072768......29918663096948
...7389034...812431496...102043139454...10912522669489....1218437834167018
..39505162..7240016321..1526189064960..268546526289340...49699856516684819
.211085078.64612694441.22840267867281.6614897944285757.2030235758746008203
LINKS
FORMULA
Empirical for column k:
k=1: [linear recurrence of order 27] for n>29
k=2: [order 65] for n>67
EXAMPLE
Some solutions for n=2 k=4
..0..0..1..0..0..1....0..1..1..0..0..1....0..0..0..0..0..0....0..1..0..0..1..1
..0..0..1..0..1..0....0..0..0..0..1..0....0..0..0..1..0..0....0..0..1..0..0..1
..0..1..0..0..0..0....0..1..0..0..0..1....0..1..0..0..1..1....0..1..0..0..1..0
..0..1..1..0..1..1....0..0..1..1..0..1....0..1..0..1..1..0....0..0..0..0..0..0
CROSSREFS
Sequence in context: A107546 A235880 A158000 * A252441 A236896 A076748
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Dec 17 2014
STATUS
approved

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Last modified July 15 23:38 EDT 2024. Contains 374343 sequences. (Running on oeis4.)