A204197 - OEIS

A204197

T(n,k) = Number of n X k 0..1 arrays with no occurrence of three equal elements in a row horizontally, vertically or nw-to-se diagonally, and new values 0..1 introduced in row major order.

1, 2, 2, 3, 8, 3, 5, 18, 18, 5, 8, 50, 33, 50, 8, 13, 128, 86, 86, 128, 13, 21, 338, 231, 265, 231, 338, 21, 34, 882, 639, 883, 883, 639, 882, 34, 55, 2312, 1724, 2974, 3716, 2974, 1724, 2312, 55, 89, 6050, 4697, 9940, 15780, 15780, 9940, 4697, 6050, 89, 144, 15842

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

OFFSET

1,2

COMMENTS

Table starts

..1....2....3.....5......8......13.......21........34.........55..........89

..2....8...18....50....128.....338......882......2312.......6050.......15842

..3...18...33....86....231.....639.....1724......4697......12763.......34668

..5...50...86...265....883....2974.....9940.....33462.....112470......377908

..8..128..231...883...3716...15780....67169....286470....1221769.....5217560

.13..338..639..2974..15780...85681...461894...2501104...13632039....74052393

.21..882.1724..9940..67169..461894..3162172..21906411..152100304..1053377463

.34.2312.4697.33462.286470.2501104.21906411.193490711.1711765962.15187321948

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..576

EXAMPLE

Some solutions for n=5 k=3

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

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

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

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

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

CROSSREFS

Column 1 is A000045(n+1).

Column 2 is A175395(n+1).

Sequence in context: A134574 A141617 A267644 * A238654 A220553 A176383

Adjacent sequences: A204194 A204195 A204196 * A204198 A204199 A204200

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin, Jan 12 2012

STATUS

approved