%I #3 Mar 30 2012 18:36:58
%S 1,1,2,5,10,27,73,189,518,1413,3857,10707,29804,83365,234665,662654,
%T 1878059,5341302,15231940,43552610,124829236,358537455,1031835260,
%U 2974872009,8590929683,24847042484,71964879243,208704926659
%N Central terms of triangle A120894 (cascadence of 1+x+x^2).
%Y Cf. A120894, A120895, A120897.
%K nonn
%O 0,3
%A _Paul D. Hanna_, Jul 14 2006