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A183335 T(n,k) = Number of n X k binary arrays with each 1 adjacent to exactly two 0's. 7
1, 1, 1, 2, 7, 2, 3, 10, 10, 3, 5, 23, 26, 23, 5, 8, 49, 66, 66, 49, 8, 13, 98, 194, 247, 194, 98, 13, 21, 209, 534, 899, 899, 534, 209, 21, 34, 431, 1468, 3254, 4643, 3254, 1468, 431, 34, 55, 898, 4102, 11883, 21708, 21708, 11883, 4102, 898, 55, 89, 1871, 11402, 43207 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Table starts

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

..1....7....10.....23.......49........98........209.........431..........898

..2...10....26.....66......194.......534.......1468........4102........11402

..3...23....66....247......899......3254......11883.......43207.......157266

..5...49...194....899.....4643.....21708.....104651......506385......2433550

..8...98...534...3254....21708....135578.....863096.....5518572.....35095832

.13..209..1468..11883...104651....863096....7279940....61405393....515820700

.21..431..4102..43207...506385...5518572...61405393...684911503...7604015546

.34..898.11402.157266..2433550..35095832..515820700..7604015546.111613234643

.55.1871.31644.572571.11727959.223543018.4341917265.84593723891

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..337

EXAMPLE

Some solutions for 7 X 6

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

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

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

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

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

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

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

CROSSREFS

Column 1 is A000045.

Sequence in context: A011401 A265647 A078202 * A196329 A196653 A196343

Adjacent sequences:  A183332 A183333 A183334 * A183336 A183337 A183338

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin, Jan 03 2011

STATUS

approved

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Last modified December 8 23:37 EST 2021. Contains 349596 sequences. (Running on oeis4.)