This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A296405 T(n,k)=Number of nXk 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 or 3 neighboring 1s. 8
 1, 1, 1, 1, 4, 1, 1, 8, 8, 1, 1, 17, 24, 17, 1, 1, 46, 82, 82, 46, 1, 1, 114, 316, 444, 316, 114, 1, 1, 289, 1182, 2868, 2868, 1182, 289, 1, 1, 757, 4560, 17783, 35561, 17783, 4560, 757, 1, 1, 1964, 17508, 110554, 368770, 368770, 110554, 17508, 1964, 1, 1, 5118, 67310 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS Table starts .1....1.....1.......1.........1...........1.............1...............1 .1....4.....8......17........46.........114...........289.............757 .1....8....24......82.......316........1182..........4560...........17508 .1...17....82.....444......2868.......17783........110554..........688248 .1...46...316....2868.....35561......368770.......3939121........42629909 .1..114..1182...17783....368770.....6200926.....107541673......1896487480 .1..289..4560..110554...3939121...107541673....3068113721.....90097748288 .1..757.17508..688248..42629909..1896487480...90097748288...4427644444522 .1.1964.67310.4288144.457078213.33169242951.2600708602697.211857339895816 LINKS R. H. Hardin, Table of n, a(n) for n = 1..263 FORMULA Empirical for column k: k=1: a(n) = a(n-1) k=2: [order 9] k=3: [order 20] k=4: [order 52] EXAMPLE Some solutions for n=5 k=4 ..1..1..0..0. .1..1..1..1. .0..0..0..0. .0..1..1..1. .0..1..0..0 ..1..1..1..1. .1..0..1..0. .1..1..0..0. .1..0..0..1. .1..1..0..0 ..0..0..1..0. .0..0..0..0. .1..1..0..0. .1..1..0..1. .1..0..1..0 ..0..1..0..1. .1..1..0..1. .0..1..1..1. .0..1..0..1. .1..1..1..0 ..0..1..1..1. .1..0..1..1. .0..0..1..1. .1..1..1..1. .0..0..0..0 CROSSREFS Sequence in context: A132789 A319251 A100754 * A174035 A303888 A305281 Adjacent sequences:  A296402 A296403 A296404 * A296406 A296407 A296408 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Dec 11 2017 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 15 15:14 EDT 2019. Contains 328030 sequences. (Running on oeis4.)