%I A025264
%S A025264 2,1,1,5,22,99,450,2067,9586,44852,211570,1005427,4810460,23157904,
%T A025264 112110906,545524287,2666864340,13092764136,64527778938,319157531592,
%U A025264 1583724160896,7882364163954,39339994155288,196843821874407,987272738842392
%N A025264 a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 4.
%F A025264 G.f.: (1-sqrt(1-8*x+12*x^2+12*x^3))/2 - Michael Somos, Jun 08, 2000.
%o A025264 (PARI) a(n)=polcoeff((1-sqrt(1-8*x+12*x^2+12*x^3+x*O(x^n)))/2,n)
%Y A025264 Cf. A025266.
%Y A025264 Sequence in context: A049252 A098315 A036563 this_sequence A139622 A152656 
               A096162
%Y A025264 Adjacent sequences: A025261 A025262 A025263 this_sequence A025265 A025266 
               A025267
%K A025264 nonn
%O A025264 1,1
%A A025264 Clark Kimberling (ck6(AT)evansville.edu)