

A222896


T(n,k)=Number of nXk 0..2 arrays with successive rows and columns fitting to straight lines with strictly increasing slope, with a single point array taken as having zero slope


2



3, 0, 0, 0, 31, 0, 0, 51, 51, 0, 0, 40, 621, 40, 0, 0, 12, 2542, 2542, 12, 0, 0, 0, 2646, 230803, 2646, 0, 0, 0, 0, 0, 3219925, 3219925, 0, 0, 0, 0, 0, 0, 44680819, 129912903, 44680819, 0, 0, 0, 0, 0, 0, 341380271, 6314798902, 6314798902, 341380271, 0, 0, 0, 0
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OFFSET

1,1


COMMENTS

Table starts
.3..0....0.........0..........0..........0............0..........0.0.0.0
.0.31...51........40.........12..........0............0..........0.0.0
.0.51..621......2542.......2646..........0............0..........0.0
.0.40.2542....230803....3219925...44680819....341380271.2205404653
.0.12.2646...3219925..129912903.6314798902.116002906380
.0..0....0..44680819.6314798902
.0..0....0.341380271
.0..0....0
.0..0
.0


LINKS

R. H. Hardin, Table of n, a(n) for n = 1..60


EXAMPLE

Some solutions for n=4 k=4
..2..0..1..0....2..1..0..0....2..1..0..0....1..1..0..0....1..1..1..0
..0..2..2..0....1..0..0..0....2..0..1..0....2..0..0..2....1..0..2..0
..1..0..2..1....0..1..0..1....1..1..1..1....1..0..1..1....0..1..1..2
..0..0..2..1....0..1..1..1....0..2..2..2....0..1..0..2....0..1..2..2


CROSSREFS

Sequence in context: A228861 A057382 A007270 * A057387 A109898 A223074
Adjacent sequences: A222893 A222894 A222895 * A222897 A222898 A222899


KEYWORD

nonn,tabl


AUTHOR

R. H. Hardin Mar 08 2013


STATUS

approved



