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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 (list; graph; refs; listen; history; text; internal format)
 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 * A253261 A280587 A273372 Adjacent sequences:  A223017 A223018 A223019 * A223021 A223022 A223023 KEYWORD nonn AUTHOR R. H. Hardin, Mar 11 2013 STATUS approved

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Last modified February 21 06:40 EST 2019. Contains 320371 sequences. (Running on oeis4.)