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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.
1
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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 11 2013
STATUS
approved