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a(n) = Sum_{0<=j<=i<=n} A027113(i, n+j).
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%I #8 Oct 23 2019 21:56:23

%S 1,4,13,40,119,350,1022,2973,8635,25074,72850,211875,616985,1799092,

%T 5253127,15358500,44958889,131759776,386557548,1135204289,3336791503,

%U 9816315842,28900431835,85147344488,251030187583,740539502786

%N a(n) = Sum_{0<=j<=i<=n} A027113(i, n+j).

%Y Partial sums of A027129.

%K nonn

%O 0,2

%A _Clark Kimberling_

%E Title corrected by _Sean A. Irvine_, Oct 23 2019