The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A223391 T(n,k)=Number of (n+2)Xk 0..2 arrays with all rows having a nonnegative second derivative, and all columns having a positive second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative 6
 11, 121, 31, 388, 961, 105, 4794, 5450, 11025, 342, 40416, 188958, 120738, 116964, 1044, 375698, 4182458, 14855514, 2326103, 1089936, 3159, 4128762, 101698908, 1030363654, 993542957, 40102656, 9979281, 9735, 41424210, 2972878486 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts ....11.......121.........388..........4794..........40416.........375698 ....31.......961........5450........188958........4182458......101698908 ...105.....11025......120738......14855514.....1030363654....80122222262 ...342....116964.....2326103.....993542957...208801521397.49244499538437 ..1044...1089936....40102656...53115687500.31140652265964 ..3159...9979281...663777212.2791742360102 ..9735..94770225.11304765020 .28302.801003204 .87129 LINKS R. H. Hardin, Table of n, a(n) for n = 1..47 EXAMPLE Some solutions for n=1 k=4 ..2..0..2..2....2..2..2..2....1..0..0..2....1..1..2..2....1..1..1..1 ..1..0..0..0....1..0..0..0....1..0..0..0....1..1..0..0....1..0..0..1 ..2..2..0..1....1..0..0..2....2..1..1..1....2..2..0..0....2..2..1..2 CROSSREFS Sequence in context: A081122 A004190 A089707 * A337707 A084969 A045592 Adjacent sequences:  A223388 A223389 A223390 * A223392 A223393 A223394 KEYWORD nonn,tabl AUTHOR R. H. Hardin Mar 19 2013 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified May 21 17:13 EDT 2022. Contains 353921 sequences. (Running on oeis4.)