A223020 Number of n X 4 0..2 arrays with every row having the same least squares slope fit to a straight line, and every column the same least squares slope fit to a straight line, with a single point array taken as having zero slope.

81, 115, 739, 1365, 13997, 35571, 468409, 1445055, 21226859, 73973931, 1148109637, 4289486945, 68628631487, 267714393779, 4363979828661, 17495451002837, 288742958413869, 1179160655695485, 19640515026470277, 81257674712215213

Offset

1,1

Comments

Column 4 of A223022.

Links

R. H. Hardin, Table of n, a(n) for n = 1..23

Example

Some solutions for n=3:
..2..0..2..1....2..0..2..2....0..1..2..1....1..0..0..1....0..1..1..0
..1..1..0..1....1..2..1..2....1..1..2..2....1..1..1..1....2..0..0..2
..2..0..2..1....2..0..2..2....0..1..2..1....2..1..1..2....0..1..1..0

Crossrefs

Sequence in context: A120457 A129151 A039546 * A357168 A253261 A280587

Adjacent sequences: A223017 A223018 A223019 * A223021 A223022 A223023

Keyword

nonn

Author

R. H. Hardin, Mar 11 2013

Status

approved