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a(n) = Sum_{i=0..floor(n/2)} T(2i,n-2i) where T is A049615.
4

%I #8 Aug 05 2021 19:49:10

%S 0,0,2,3,9,11,22,26,43,49,74,82,115,126,168,184,239,256,322,343,421,

%T 449,544,574,683,720,846,889,1035,1081,1244,1298,1479,1540,1746,1814,

%U 2045,2120,2372,2456,2737,2826,3130,3229,3557,3669,4032,4146,4535,4661,5080

%N a(n) = Sum_{i=0..floor(n/2)} T(2i,n-2i) where T is A049615.

%K nonn

%O 0,3

%A _Clark Kimberling_

%E More terms from _Sean A. Irvine_, Aug 05 2021