%I
%S 1,2,7,20,60,176,518,1520,4461,13090,38423,112828,331487,974442,
%T 2866125,8434992,24838275,73181142,215729781,636275820,1877569134,
%U 5543095404,16372140876,48377825216,143009973875,422918975726,1251154692297
%N a(n) = number of (s(0), s(1), ..., s(n)) such that s(i) is an integer, s(0) = 0, s(1) = 1, s(i)  s(i1) <= 1 for i >= 2, s(n) = 2. Also a(n) = T(n,n2), where T is the array defined in A025177.
%F Conjecture: (n+2)*(n3)*a(n) +2*(2*n+1)*(n3)*a(n1) +(n^2+10*n18)*a(n2) 3*(2*n3)*(n3)*a(n3)=0.  _R. J. Mathar_, Feb 25 2015
%Y First differences of A014531. First differences are in A026069.
%K nonn
%O 2,2
%A _Clark Kimberling_
