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A223194
Number of nX7 0..2 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative
0
1143, 1306449, 52906752, 76015542500, 49198404222036, 36214510060655577, 36869649918720635277
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OFFSET
1,1
COMMENTS
Column 7 of
A223195
LINKS
Table of n, a(n) for n=1..7.
EXAMPLE
Some solutions for n=3
..0..0..0..2..0..1..2....0..0..0..1..2..2..2....0..0..1..0..2..2..2
..0..0..0..1..0..1..1....0..0..0..0..1..1..2....0..0..0..0..0..1..0
..2..0..0..2..0..2..1....0..0..0..0..1..1..2....2..0..0..2..0..2..0
CROSSREFS
Sequence in context:
A252428
A251773
A116174
*
A265504
A237458
A202312
Adjacent sequences:
A223191
A223192
A223193
*
A223195
A223196
A223197
KEYWORD
nonn
AUTHOR
R. H. Hardin
Mar 18 2013
STATUS
approved
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Last modified April 25 09:24 EDT 2024. Contains 371967 sequences. (Running on oeis4.)