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%I #6 Jul 02 2023 12:48:14
%S 1,4,25,265,3793,70789,1600429,42811078,1316981794,45858363502,
%T 1781106761686,76349861206627,3579325969675135,182170488961796899,
%U 10002072131444031160,589261706147357617009,37076870479319887575253,2481442922857293505594237
%N Row sums of triangle A144280 (called S2hat(-3)).
%F a(n) = Sum_{m=1..n} A144280(n,m), n>=1.
%Y Cf. A144280.
%K nonn,easy
%O 1,2
%A _Wolfdieter Lang_, Oct 09 2008
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