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A223157 T(n,k)=Number of (n+2)X(k+2) 0..2 arrays with all rows and columns having a strictly positive second derivative in a quadratic least squares fit 3
99, 989, 989, 16089, 25929, 16089, 215563, 1328305, 1328305, 215563, 2616383, 55977857, 261298801, 55977857, 2616383, 31465359, 1853983303, 40346506449, 40346506449, 1853983303, 31465359, 363006521, 63763662879, 4545405907875 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Table starts

........99.........989.........16089.........215563.......2616383....31465359

.......989.......25929.......1328305.......55977857....1853983303.63763662879

.....16089.....1328305.....261298801....40346506449.4545405907875

....215563....55977857...40346506449.22503661157680

...2616383..1853983303.4545405907875

..31465359.63763662879

.363006521

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..30

EXAMPLE

Some solutions for n=1 k=4

..2..2..1..2..1..2....2..2..1..0..1..2....2..2..0..0..1..1....2..2..2..0..0..1

..0..1..0..0..1..1....0..1..0..0..0..1....0..0..0..0..0..1....0..0..0..0..0..1

..1..2..0..0..2..1....2..2..1..2..1..2....2..0..1..2..2..2....1..2..0..2..1..2

CROSSREFS

Sequence in context: A135219 A182672 A124113 * A223155 A308466 A093299

Adjacent sequences:  A223154 A223155 A223156 * A223158 A223159 A223160

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Mar 16 2013

STATUS

approved

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Last modified October 7 12:03 EDT 2022. Contains 357271 sequences. (Running on oeis4.)