%I #7 Jan 16 2025 11:16:28
%S 0,2,1,0,2,1,4,6,10,24,36,85,152,310,638,1232,2620,5194,10840,22332,
%T 46004,96528,199816,420365,880112,1851366,3908854,8245536,17482220,
%U 37049662,78746776,167602164,357127116,762506640,1629288824,3487128706,7470956240
%N a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ... + a(n-3)*a(3) for n >= 4, with initial terms 0, 2, 1, 0.
%K nonn
%O 1,2
%A _Clark Kimberling_