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%I #4 Mar 18 2013 20:10:15
%S 2,4,5,11,19,37,68,137,261,547,1047,2085,4158,8483,16466,33212,66193,
%T 131898,263948,527527,1050219,2116671,4211442,8401051,16832288,
%U 33765064,67162966,134559866,269065487,537669433,1075891821,2151469377,4297450870
%N Number of nX1 0..1 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
%C Column 1 of A223227
%H R. H. Hardin, <a href="/A223220/b223220.txt">Table of n, a(n) for n = 1..122</a>
%e All solutions for n=3
%e ..0....1....1....0....1
%e ..0....1....0....0....0
%e ..0....1....1....1....0
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 18 2013
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