A262338 - OEIS

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A262338

T(n,k)=Number of (n+3)X(k+3) 0..1 arrays with each row and column divisible by 9, read as a binary number with top and left being the most significant bits.

2, 4, 4, 8, 16, 8, 15, 64, 64, 15, 29, 225, 512, 225, 29, 57, 841, 3375, 3375, 841, 57, 114, 3249, 24389, 19149, 24389, 3249, 114, 228, 12996, 185193, 132085, 132085, 185193, 12996, 228, 456, 51984, 1481544, 1268613, 923065, 1268613, 1481544, 51984, 456

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

OFFSET

1,1

COMMENTS

Table starts

...2......4........8........15........29........57.......114........228

...4.....16.......64.......225.......841......3249.....12996......51984

...8.....64......512......3375.....24389....185193...1481544...11852352

..15....225.....3375.....19149....132085...1268613..15745355..207996061

..29....841....24389....132085....923065..12317549.264095825.6638113901

..57...3249...185193...1268613..12317549.330217585

.114..12996..1481544..15745355.264095825

.228..51984.11852352.207996061

.456.207936.94818816

.911.829921

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..71

FORMULA

Empirical for column k:

k=1: a(n) = 3*a(n-1) -2*a(n-2) -a(n-3) +3*a(n-4) -2*a(n-5)

k=2: [order 11]

k=3: [order 17]

EXAMPLE

Some solutions for n=4 k=4

..0..1..1..0..1..1..0....0..1..1..1..1..1..1....0..0..1..0..0..1..0

..1..1..1..1..1..1..0....1..0..1..1..0..1..0....1..0..1..0..0..0..1

..0..1..1..0..1..1..0....0..1..0..1..1..0..1....0..1..1..1..1..1..1

..0..1..0..1..1..0..1....0..0..0..0..0..0..0....0..1..1..1..1..1..1

..1..1..1..1..1..1..0....1..0..0..1..0..0..0....1..0..1..0..0..0..1

..0..1..0..0..1..0..0....0..0..1..0..0..1..0....0..1..1..1..1..1..1

..0..0..1..1..0..1..1....0..1..1..1..1..1..1....0..1..0..1..1..0..1

CROSSREFS

Sequence in context: A189161 A189343 A189779 * A368043 A283691 A283130

Adjacent sequences: A262335 A262336 A262337 * A262339 A262340 A262341

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin, Sep 18 2015

STATUS

approved